Complete Nooob Here. Need Help!

[CNOTEZ]

ALRIGHT so im a complete noob and i wanna know how to mod my htc touch. ive seen in a bunch of places different things that can be done but i have NO idea on where to even start. can anyone help me out. so far i know that for anything im gonna need a thing called a registry editor. where can i get freeware on this? what else do i need to know/not know.thanks in advance.