Haha, I'm just starting out... but here are my takeaways from probably 100+ hours of research and experimentation:
1. Don't use a half helmet - it makes getting good audio a CHORE AND A HALF (I'm still trying to figure out a mic setup that'll work - riding my Street Glide gives me crappy audio, but I daily ride it; my Vulcan bobber gets great audio, but I don't ride it much, so what good does that do me for vlogging?)
2. Experiment, experiment, test. Do lots of audio and video tests. Play around with camera and mic placement.
3. Realize that at the end of the day, there are sunk costs. You're gonna buy a camera, get a good one. You want mounts? They cost $$$. Mics? Same thing. If you go into planning to be up and running and making money on Day 3, you'll be sorely disappointed. Plan on making the tests part of the fun, or you'll quickly grow bored/frustrated with it. Maybe have a backup use for the expensive bits - for instance, I use my GoPro to record my kids playing or on zoo trips and the like, then practice in the editor to create videos for my friends and family to see.
4. Plan your rides and what you want to talk about, and stick to that.
5. The editing software you choose makes a HUGE difference. I started with HitFilm Express, tried VDSC, now I'm on Davinci Resolve ... of the 3, Resolve seems to be the best for me, but it's still a slow slog (I'm learning).
6. Have fun! If you're not having fun, why do it?
Good luck!
-John
PS: I still haven't set up my YouTube channel, nor have I produced a usable video.