First off, aiming to start in security is a fools errand. Security is one of the many paths that your career might take after you gain some knowledge.

Some more random thoughts before real advice. The two hardest things in IT are getting into help desk, and getting out of it. The reason is two fold: 1) help desk is the great entry point for the greater IT industry, and 2) one person in a help desk role is fairly similar to another when it's time to move out of help desk.

Now: If you have the time, go to your local community college and take their it/networking/security program. The degree will help - you won't skip help desk (unless your lucky), but you are better equipped for getting out of it. You will also learn a bunch of stuff, get some projects to stick on a resume, etc.

If you don't have that time you can go the cert route. Be warned however - certs do not substitute for real experience. Do not fall for the trap of thinking that getting X cert is your ticket to Y job. You will be in for a ride awakening when your sitting across from someone like me that only asks situational, hypotheticall questions with no correct answer ( I care about how you think and approach problems over book smarts).

Ok. Last bit of advice: the 10 things I look for (in order) when interviewing entry level help desk.

1. customer service skills,
2. ability to learn,
3. customer service.
4. some mild interest in tech.
5. customer service.
6. the ability to learn troubleshooting.
7. customer service.
8. the ability to admit you don't know..
9. customer service.
10. not being an asshole.

I can teach you how to fix a printer, design a network, or spin up infrastructure in the cloud. I can't teach you how to act around people.