For smaller creek trout stick with fly sizes 12-16. I prefer the Hare Ear, San Juan Worm(wire worm), Prince Nymph, Evil Weevil, i like all leech patterns, helgramites, backswimmers, those are my preferred nymphs but i will always try to put a nymph on according to the hatches, so if you can find info on when general hatchs happen or if you start to see certain bugs flying around get a pattern imitating them and throw it on. I only use dry flys when there is a big hatch or abundance of a certain bug around.

Ive never fished for bass but they are a predator fish and i know that predator fish will prefer a bigger meal so if you were to fish for them i would suggest using streamers.