You'll want the "official factory repair manual" or repair manual on dvd. The service manual isn't going to have it. I think eBahn would work too. Another option would be a short license to Audi's online site.
No matter what you get it will assume you know how to rebuild a tranny. It won't have step by step like a Haynes manual does for repairs(it won't cover the trans either) A lot of it will probably show diagrams and assume you know how to get the trans disassembled to that point.