Hello, being easy on you =] I would first say, try out the stock ROM! it is neat and amazing for the average user to be honest, if you plan on staying on stock ROM for now... install the two cabs supplied by this thread here.
http://forum.ppcgeeks.com/showthread.php?t=85996
I would also say to take a look at this thread found here for neat mods!
http://forum.ppcgeeks.com/showthread.php?t=78019
hit thanks if you want.