hi i am kind of new on this thing so i would appreciate any help you can give me in how to do a twilight birthday cake, thanks !!!!!

i suggest doing a search in the galleries to first get an idea of what you want to do for the cake. If there is something specific that you want help on how to do then we can better help answer your question of "how to" do it.

I find an article on how to do a cute one
http://hubpages.com/hub/How-To-Make-A-Twilight-Cake

I agree with looking in the galleries. They had a Twilight contest recently and the whole contest gallery is nothing but Twilight cakes. There's bound to be ideas you can use.