The first thing anybody should EVER do (ever!!!) upon getting a new game is look up the key mapping! This tells you EVERYTHING you need to know about getting started. You can do this in-game by looking up the settings for controllers, and going to "keyboard mapping" or look it up in the help section of the main webpage menu.
It will tell you everything from engine start, to throttle, to RPMs, to WEP, to gear, flaps, guns, bombs, rockets, and oh, so much more.
See if that doesn't answer your questions.