there is a website called: trashzen.com which tells u good ways to do amazing tricks.helped me but i no most tricks lol
also to lighten it...u could take the bash plate off,drill some holes in the lever(only metal),saw half the bash ring(if u have one) and basicly drill LOTS of holes.only lightens it by 200-300 grams but the lighter u can get it the bettr.
hope i helped and have fun with ur new bike. with that website u will be backhopping of crates in a month lol
u should probably also get a front cable disc brake and a back hydrolic hs33 if u dont have one already because on some(most) the brake will begin to slip.DO NOT USE TAR.my mate put tar on his first day and his front wheele would not move.Onza comps are actuly really good bikes.i ride an onza t-pro 07(wel the frame is) should be real light.
hope i helped(again!)lol