You can only move the lure back towards you after you cast. You have to reel the lure all the way back in before you can cast it again. Most flies are single-hooked and the hooks are usually smaller. Most fly-caught fish are hooked in the lips. The heavier the fly line, the bigger a fly it can cast.
Level lines are the least expensive and the hardest with which to learn to cast.
Double Taper lines are easier to learn to cast but cannot be used easily for very large flies. When one end of a level L or double-taper DT line wears out, you can turn it around and use the other end. The super stiff higher modulus rods will not help you learn to cast properly. SOME Ultralight Spinning rods will cast several different weights of fly lines quite nicely. Decide which fishing you will be doing and tackle-up in accordance.