Well, when I was at that point I relied on a few carefully chosen contacts and pelted them with requests for advice for a year or two until I had the hang of it. :-)
The OASIS Guide to Asperger Syndrome can be useful, as can Parenting Your Asperger Child. Neither of them had all the answers, but they are sensible and served as background for me.
It's great that you are not new to the world of IEPs, and that you've already got the IEP. Adjusting is easier than starting from scratch.
I don't have anything to read on ABA, but the principle is to choose a skill to target, teach and reinforce it till it's mastered, then keep reinforcing it for a while in a variety of contexts until it becomes natural. We find this a useful tactic in all areas of life.
Happy to talk as needed,
DeeDee
