Find copies of Eddie Robin's Winning One Pocket and Shots, Moves, Strategies(books, and pricey but there's nothing better for 1 pocket info,) then buy as many accu-stats 1 hole videos you can...
I imagine Grady Matthews instructional dvds have to be good, as when I hear him doing commentary on 1 hole matches i always learn something. Other matches that I have learned a lot from watching is the Ronnie Allen vs. Deliberto challenge match that was recently sold on here... and any video I can find with Bugs Rucker is usually amazing. Accu stats has a Jersey Red video too, and I recomend it...
I think Freddy the Beard says the best accu-stats tape for learning 1 hole is the Jimmy Fusco vs. Jim Rempe(someone please correct me if I'm wrong)
match from the 91 legends of one pocket, philadelphia style... haven't watched it yet myself... its next on my list.