Hi Dj, I don't really fish for bass on purpose much, but I have caught some on almost any fly with a black body and red wire somewhere on it...I don't know why.
My go-to streamer is a wooley-bugger or something that's like it. You have to play with color, and size but generally smaller will work out better, at least for trout.
At one lake, I was catching 20 inch rainbows on only one color of streamer...I know someone else who was catching more of the same sized trout using a similar color but in a wooleybugger pattern.
I've also caught trout using nymphs and chironomids using very small hooks...in the 16 to 22 range. I generally refuse to use a midge smaller than an 18, just becaus they're a pain in the butt for me to thread...sometimes the leader is thicker than the eyelet hole.
Me, I've tied up some pretty large streamers, but I've also ended up trimming many of them.
Basic streamer colors: Olive, black, brown.
Here are the streamers that I catch most of my fish on: Wooley Bugger, Olive Matuka, leach patterns.
In addition to streamers, pretty much any suitably "buggy" nymph and midge has pretty much caught fish. You can read up on how to fish with them, but I've caught most of my fish in a river with either a brown, or a black nymph drifted with an indiator.
You can fish a streamer and a nymph/midge with a spinning reel and a float or a bubble if you don't have a fly rod.
Pretty much almost any other fly will catch a fish under the right conditions, so the best thing to do is get a few of the basic flies I mentioned, then get No MORE THAN THREE DIFFERENT other flies from a real flyshop the the shopkeeper recommends. At two dollars a pop, you can hit fourty dollars easy...I've hit eighty dollars a visit for flies, and most of the "other" flies that you buy will go unused for a long time. You usually only really catch fish on a few flies...the trick is to figure out which few
good luck and post pics