disagree with the jig of atleast 1/2 oz. Sometimes a slower fall is wanted and a 1/8oz will work nicely if the vegetation is thin.

More Hints:
1. Pitch to the shady side of stumps and docks
2. Keep the entry as quite as possible around stumps and debris.
3. Dont cast just to the sides of docks only, cast deep under them and retrieve through the framework. Try to skip the jig as far under the dock as possible.
4. Many docks have sub frame beams that run from post to post. Cast/skip a swim jig under the dock, then swim the jig into those beams and then let the jig fall after impact (much like a crankbait or spinner bait). Often times a strike will occur right after impact.
5. Its a lot easier to pitch a jig with a spinning reel than a bait casting reel when you are just starting.