this is a little vague, but start here:
http://forum.ppcgeeks.com/forumdisplay.php?f=98
start reading here. Best thing is to unlock your phone with the HSPL unlocked. Then you can download any of the "Chefs" ROMS and put a brand new OS on your phone. They add cool little programs and add functionality. All you have to do is read a lot and gain the knowledge, you'll do fine
