A lightweight but steady boat, 10hp+ outboard, trolling motor, and a pushpole.
Some 300-600lb line
big NON Stainless hook
Pretty much all you need.
Yep. Simple as that. You will also need a cheap shotgun that is no big deal if you lose it overboard. I've got an old H&R single shot 20 gauge that worked great. Picked it up at a pawn shop for $50. #6 low brass shells at a distance of a couple of inches do just fine.
For the hook and line, here is what I used.