Need some help starting out (beginner)

Ok, so y'all might not care, but I'll say it anyways, first off my uncle owned a track nearby for a while when I was younger, I raced a good bit, but a few years, financial problems, and kids, and he had to close it. Well just a few months ago I've gotten back into riding, I bought a klx 125 for 300 bucks not running, got it home, cleaned the carb and it fired up. Well after a few months I decided to go bigger, sold the klx for 900, (after I bought a used bbr for 150, so I had 450 total in it) then went and picked up a 2006 crf250r with nothing wrong with it besides the lack of kick starting, it will push start, but only kick start when it's hot. Any ideas on what this could be? Also smokes for about 30 seconds when you first start it. Now to the bad part.. I bought it Friday, and last night (Sunday night) my buddy talked me into riding it and hit a guide wire going about 40, tore him and the bike up pretty bad. He's got a broke arm, bruises, broke nose and a bad cut from where the wire got him. But he's home now, and texted me earlier saying he will pay for the damages, so far I know it needs a radiator, side fender, front fender, front number plate, bark buster, and the forks are scratched up, but it won't hurt the performance. Anyways. After I get it fixed and all, what do I need to do to start racing? There's a couple tracks an hour or so away, so practicing and all is no problem, even though I've been practicing a good bit, I still need more. Is there a good time to start? What class would I be in? Any tips from other riders out there? Also where would be the best place to order fenders, radiator and bark buster? Just gonna go ahead and get all new fenders since all I have is a good back and left side. Looking for cheap, bc he's a good friend and I don't wanna screw him over. Sorry for dragging on, but if it's like other forums, pics will make it better!!
When I got it:

After the crash:





My buddy that wrecked: