As A Newbie to Trials myself .... Thebigjam101 above is spot on. Trashzen has been a massive help. I ordered their book from Tarty Bikes last week. Its brilliant. Starts from the begining and takes you through everything. Bike Set up, choice of bike, Gear, and then the majority on how to perform the moves. Well worth the £20.
I'm still crap though! haha. Give me time and practice