Hello :)

So I'm getting closer to getting legal. I finally got a license in the spring, and now I'm ready to get a number plate... especially since I finally got stopped about it for the first time.
(I'm in a historically low enforcement place for small bikes)

I know there's never one answer, but I'm wondering if there are any rules about punishments I might face.

If I try to register my bike for the first time when I've owned it for a couple years already, what are they supposed to do to me?