Jsteelhead gives very good advice about getting professional instruction. I speak from bitter experience as I began teaching myself to flycast at about age 10 and have had a lifetime thereafter trying to unlearn the bad habits I picked up in the process.
A few hours with a competent teacher (not all good casters are competent teachers; get some recommendations from people you trust) can start you right onto a long, long period of great enjoyment. Few things, apart from hooking and landing fish and the other thing, give the satisfaction of executing the perfect flycast effortlessly. Or so I've been told. Someday, maybe I'll do it.
There are many ways of dealing with the "shooting" part of your line, depending on the situation. When fishing from a boat, try to remove as much of the clutter around your casting area as possible. If there's something to tangle on anywhere near, your flyline will seek it out and snag on it. Every time. Guaranteed.