This game is great. Welcome, sir, the community we have here is outstanding and most of the guys will bend over backwards to help you. The aforementioned links will help a lot. It is very easy to get frustrated with this game, remember they are cartoon airplanes and not to get all bent out of shape over it.
If you must look on the web, netaces.org is a great place. There are also some books that are very helpful. One is called "In Pursuit: A Pilots Guide to Online Air Combat" by Johan Kylander another is "Fighter Combat: Tactics and Maneuvering" by Robert Shaw. Both are good and will help a lot, though they are a dry read. Only get them if you are serious about this game otherwise you will have wasted your money.
Have a great time and again, welcome!