Well if you have the ownership for your bike (which I really hope you do) then you just go down to the DMV where people register their cars and you just register it like that. It's 13% of what you paid for the bike (and $50 for a plate) so be prepared
Also I got my dirtbike insurance from statefarm I'm pretty sure and it's under $200 a year. My Dad takes care of all the paperwork and everything so I'm not 100% sure on all of it but it is, for the most part, accurate.