sometimes less is more,in other words there are days when all you need to do is raise the jig about an inch off of the bottom and just sit still,when the rod feels heavy,reel down to the water and set the hook.
other days you may have to literally pound the bottom like a wrecking ball to wake em up,it can vary day to day.
change up colors/sizes often ( every ten minutes if you are not getting bites )
sometimes they want a vigorous minnow or chub,the next time they wont bite on them unless the minnow/chub is dead and has been for several hours or more.
the best advice I can give you for what its worth,keep a journal of your outings,ie,time of year/day,weather patterns,depth,etc.this really works on a water body you frequent so that you have somewhat of a pattern that you can follow on like days next time out.
if all else fails,slip the guy at the bait shop a fiver lol