I am an absolute beginner at fly fishing and am wondering what are the basic flies to buy and use. I fish the Holston and was there the other day. The guy near me was slaying the trout on nymphs. That's all I could get out of him. All i had were dry flies so I only got one bite. Any help would be very helpful. I plan on stocking my flybox pretty soon, but just don't really have a clue!