Deep is a relative term. If you are from TX it is anything over 5'. I seldom catch anything over 70' deep here in MO but do catch a lot of fish from 30-55' deep in the winter. Last year a big money tourney was won with the fish coming from 105 fow.
I use tubes, jigs, grubs, and jigging spoons for my deep fishing. If you have any bluffs where you fish, I suggest you get on the end of some of them and do some experimenting.