Welcome. It's hard to say where to start first becuse there are usually so many issues it's overwhelming as to where to begin.
It involves spending, and the first spending I would do is spend a lot of time combing the car with a fine tooth comb. You might want to start out by pulling the interior. That way you can better assess the chassis. Also, look every welded seam over carefully, including removing the cowl and inspecting as deep inside as you can.
I took a click at your site. I'm almost wondering whether or not I have heard of your band, maybe on the raido where they play 2 new bands and people vote on them, or maybe on the county cable channel, whereby they play some videos in the music genere of my choice.
Even though I'm just on this side of 50, I have worn thin of typical "classic rock," and my listening interest includes what seems to be labled as extreme alternative: A couple of my favorites are Hatebreed, Soil, and Nonpoint. Another one that a man my age isn't supposed to listen to it is Kitty. Of coures, do traditional old fasion listening such as hair/metal bands.
Anyway, go over the car, take pictures of problem areas, and make a list of questions to ask. You'll find plenty of help here.