In all honesty, I could tell you what to do (though I don't have time right now) but I really feel that if you figure it out yourself it will be a lot more rewarding. To do that:
figure out which traits are dominant, recessive, line bred
pair up geckos that share recessive traits if you want that trait to show
look at the possibilities and decide which interests you the most
If you're having a particular problem figuring something out, I'm sure someone can help.
THat said, I would imagine that sooner or later someone will just tell you what to do.
Good luck with it.
Aliza