Now, suggested controller mapping:
Right stick should be pitch and roll, triggers yaw. Slew should be D-pad, Right bumper fire left bumper countermeasures. Left stick should be free look, if that's an option. I'd personally have Back be weapon select, B as gun select, A as lock target, Y and X as master mode nav and air to ground respectively, Start as next waypoint. Everything else mapped to keyboard. Yes, even throttle. There's a lot of personal preference there, but that puts everything you'll commonly use right there. If you're creative and the action doesn't feel too awkward to you, you could map some more buttons by using shift, ctrl, or alt as modifiers to your four buttons, and to use your d-pad as pitch and roll trim. Trim is your friend, especially with the very limited range of motion from one of those sticks. I'd personally use l-shift and d-pad for trim, and make the l-shift modified buttons autopilot modes, and the bumpers be skhval zoom, start and back be tracking gate size.
Finding a good controller scheme that's comfortable to use, though, is almost as important as learning to keep your head on a swivel.