Lots of good articles on the FLW web site regarding this subject. Just do a search and you should be able to come up with some good info. Let me know if you can't find them and I will see if I can get you the exact link. I fished a BASS Elite Series event as a co-angler (with Shaw Grisby...Great guy!) and found them very informative.

As for my two cents worth you would be better off hiring someone like Dave Stewart and having him teach you a few things over several sessions. Then sign up in a local bass club and put that information to use. I don't really see that much benefit in the co-angler deal when you consider it over the majority of the boaters. I'm sure others will disagree but that was my take.