Re: one fly
My favorite fly is a Chartreusse size 10 "Lil' Bugger". Seriously, do yourself a favor and tie a few. The best fly I've ever fished and it works excellent on literally ANY freshwater fish in ANY fishing condition.
Hook TMC 5262 sz 10
Tail : Chartreusse rabbit fur
Body : palmered chartreusse ostrich hearl
Put on a bead head. Cut off the fur from the rabbit strip and tie it at the top of the bend if the hook. Take a couple strands of ostrich hearl and Palmer them forward and tie them off at the bead head. That's it! Easy peasy and it is the best fly I have ever used. Tough, great motion in the water and most importantly works. You can tie it in any color, but I like Chartreusse the best.