1/32oz or 1/16oz or 1/8oz jigheads
Always thread your grubtails on the hook so that the tail bends OPPOSITE then the hook, that why the tail doesn't catch on the hook as easily.
clear water river, yes natural colors work best.
watermellon or green pumpkin, silver/gray, black or white and that PB&J colors work great.
I would start out with a 2" grubtail and maybe go up to a 3" if there are larger fish, but a 1/16oz jighead with a 2" grubtail is my all time favorite bait to throw.