Firstly, welcome to the forums! I hope you have much fun and friendship on here!
1st thing I like to see done is brakes and supension work( including quality rubber). Power is no good if you can't keep it on the ground. Then the 'little things' that need neatening up like loose bodywork, blown bulbs, loose wiring etc; all the things Plod may look for a reason to make life difficult. THEN the fun starts. There's much info' and opinion on here:take it all on board, stir once, digest, and plan your course of attack. Have a firm end result you want to acheive (use, power, economy, 'feel' sound, look, degree of legality etc) and try to stick to it!
Enjoy!!