I flyfish some, but it's mostly a novelty technique to me (apologies to all hard-core fly-types). But if I were headed to AC and Hell-bent on fly fishing, I'd run up to El Pescador and buy some local flys from their tackle shop. While I was there I'd either book a trip with one of their guides (expensive) or, at the least, get as much info as possible from them. Good Luck!