Let's see, generic trans and trans fem advice. Stream of consciousness, no particular order. A lot of these are assuming you're a binary trans person aiming for a binary transition to female. If passing isn't something you care about, then a lot of this won't apply. A lot of this also discusses things that arise from medical transition such as HRT. If that's not something you want, then some of these won't apply.
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If passing is your goal, start working on your voice today. Voice is one of the strongest tells there is. Medical transition is an agonizingly slow process, waiting for hormones to have their time to act, waiting for surgical wait times, etc. But voice is one of the few parts of transition that is effort-based and also costs nothing. Start working on it today; there's simply no substitute for putting in the work.
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EYEBROWS!!!
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When picking out a wardrobe, be sure to dress your age. If you just want to say, "fuck the world, I don't care what you think!", fair enough. If you want to transition and assimilate into the world as a functioning adult woman, then you need to dress your age. Wearing skirts that are more appropriate on a 14 year old can be a fun exercise in wish fulfillment and making up for lost time, but dressing your age is essential if you actually want to assimilate in to the social role of a late 20s woman.
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START PEOPLE WATCHING. Seriously. Go to a mall, a farmer's market, or some other location large groups congregate. Look at people. Actually look at them. Observe the subtle differences in behavior between men and women. Body language. Posture. Speech patterns. This is also how you figure out how to dress your age. Don't creep on people. But just subtly observe. Yes, some gender rebels will lament that you shouldn't have to appeal to feminine standards of behavior, and that gender is a social construct. But "construct" does not mean "meaningless." If your goal is to actually transition and live as a woman in this society, you'll need to adopt most of the social norms of the female gender. This doesn't mean that you need to appeal to every stereotype; you can be a tomboy. But if your behaviors fall entirely within society's social construct of the male gender, you will be gendered male. Once you observe these behaviors, start practicing them and changing yours to match.
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If you are seeking medical transition, you are responsible for your own transition. Not your doctor. You. Really internalize this. Trust but verify everything your doctor tells you. Good trans medicine is the exception, not the rule. If you transition and live for years as trans, you will experience mistreatment in healthcare. You will likely be underdosed. There's a good chance your doctor will tell you your E levels are fine when you're sitting there with levels of a post-menopausal woman. Trust but verify everything your doctor says. After bloodwork, NEVER simply listen to your doctor when they just say, "your levels are fine." Insist on seeing the actual numbers yourself, and know what range you should be aiming for. People routinely lose years of progress because of doctors humoring trans people with criminal underdosing rather than actually prescribing effective doses. If you need to, DIY. It's not as scary as you think it is, trans people DIYing is the rule, not the exception. Learn what trans broken arm syndrome is and be on the lookout for it.
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If you're looking for name ideas, again, it's a personal approach thing. If you're looking for ideas and just want something that won't stand out, consult the census. At least in the US, the Census publishes a list of the most popular baby names by year, sorted by sex. Go and look up the most popular baby names FOR THE YEAR YOU WERE BORN. Often times trans people will chose a name that is popular today, as in a popular name for babies being born today. This is how you end up with someone in their twenties having a name that seems more appropriate for someone in kindergarten. Names vary in popularity with time. If you choose a name that doesn't match you age, it will stick out. Same thing if you pick a name from anime or from a culture you're not a member of. Again, if you don't care about sticking out, fair enough. But imagine yourself at 60 with your name. That's the kind of timeframe you need to be thinking about.
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If doing medical transition and HRT, stockpile stockpile stockpile. Supply disruptions are common, and restarting care can be difficult each time you move.
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Be prepared for your position in the world to change. Say goodbye to male privilege. (Though trans people rarely get the full privilege level of their birth sex.) Be prepared to change how you physically navigate the world. People will treat you differently. It will become much less safe to walk out alone at night. You may get catcalled. People will expect you to act in a feminine social role. And if you don't, you will be judged for it. You will get talked over. Your ideas will go unheard. Sticking up for yourself will get you labeled as "difficult" or "aggressive." Basically you get all the crap that gets piled on cis women, plus the crap that gets piled on trans people.
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Really talk with your partner. Are they really up for this? Most cis people really don't understand just how much transition can change. Cis people tend to think of transition as a very cosmetic thing; most don't even know what hormones do. They think breast implants and genital surgery. That is what transition means to them. They really fail to understand that if you go on HRT, you are very literally altering your sex at a fundamental level. They're not anticipating the entire smell and pheromone profile of their partner changing. They're not anticipating the changes in body hair, muscle and fat distribution, genital changes, etc that come with hormones, or even just the change in behavior that often comes with transition. And it's very common for partners to want to make the relationship work. They'll say, "I'll love you no matter what," and they will actually mean it. But you can't control what you're attracted to. If someone is attracted to masculine bodies, they're attracted to male secondary sex characteristics. They can't help it. They can't change it any more than a gay person can choose to be straight. But because cis people think transition is cosmetic, they often feel that as long as they're not bigoted, they can still love their partner and be with them. Then their partner's secondary sex characteristics completely flip, and they lose all sexual attraction to them. Personally, if I was in this situation, unless my partner had a clear history of bisexuality - having actually slept with both men and women prior to me transitioning - I would assume the relationship to be doomed. Sometimes people can make it work. But transition in many ways fundamentally changes your sex. You are becoming a woman. If your partner isn't attracted to cis women, they probably won't remain attracted to you. You can still remain close lifelong friends, but realistically, the vast majority of relationships that are "straight" at the time one partner comes out end up not working out long term.
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Learn to dress to your strengths. If you're like most trans women, you probably have wider shoulders than you would prefer. Certain clothes look good on different body types. Learn how to dress yours.
Sorry for the info dump. This wasn't meant to be a coherent thing, just a collection of tips and things to think about. I may add others later as well. For background, I'm a trans gal myself. 15 years HRT and living out, 13 post FFS and SRS. I have extensive experience both with the transition process and navigating the world as a newly transitioned woman. Feel free to ask any questions you might have.