Use as big a hook as you can get away with....thats my rule of thumb.
with that being said, grab a package of of each size and throw them in the tackle box. Then you can just throw whatever hook in you need/want.
I mainly use 3/0 hooks for my tubes, worms, etc for my smallmouth buddies, and a 4/0 hook for most of my soft plastics for largemouths. Extra big stuff or topwater I go 5/0.