Motorcycles

Bicycles are much different than motorcycles. I rode thousands of miles on road bikes as my main method of transportation over the years. Not many skills transfer, unfortunately. 400-600 cc, singles and twins are gonna be the sweet spot for transitioning from beginner to intermediate rider.

I'm also not sure the course will allow you to bring your own, but worth checking to make sure. They usually have sport, cruiser, and standard bikes to choose from, and they know they're in good condition and appropriately sized.

I rode a 50cc scooter for 5k miles before I stepped up to a proper motorcycle, no course, and was way over my depth when I did. I failed the license test twice before I passed on the third try after many hours of parking lot practice. I had a coworker who had taken the course before purchasing his bike, and when I rode with him afterwards, he could barely get the bike in gear.

My advice: I would strongly suggest dialing back your expectations, it can be a very dangerous activity to engage in naively. Take and pass the beginner course. Read books on motorcycling: Total Control by Lee Parks, Proficient Motorcycling by David Hough are great places to start. When you get a bike, something modestly sized, gear tf up and practice practice practice, parking lots and low stakes streets exclusively for the first little bit. Slowly build up your experience and confidence. Beware Mt. Stupid.

Ride safe.