Putting wire on Bonsai properly is one of the hardest things to learn. Check out this video from Mauro that has some excellent tips on getting it right. This guy basically taught me how to wire in 1 day. That day I acquired the nickname, The Snail. I am sure you can guess why.
While this is not the best video for basic wire design, once you know the general idea, some of Mauro's tips will make wiring much easier. Mauro is the wiring master and is a magician at taking a tree and making it awesome the first time he touches it.