Does anybody have any tips on doing a ollie 180, pop shuvit, and a kickflip?

A great video to watch is "Yeah Right" from Girl skateboard Co. It has some awesome footage in the beginning of skaters performing trick in extremely slow motion. This might let you get a handle on the mechanics involved to perform some of these tricks. (There used to be a copy floating around on Youtube. Otherwise, Netflix has it.) There are also various websites that describe how to perform these tricks and improve your technique. On of the better ones I've seen is the skateboarding section at About.com