Hi Max
Getting airborne can be a challenge in AH!
First, I suggest you pick an aircraft that does not require much rudder input during the takeoff. Some aircraft in AH (like the Mustang) require a fair amount of rudder use in the takeoff roll...avoid them. I found that using the keyboard rudder control was too difficult...I tended to overcontrol the rudder. I now use TM Elite rudder pedals and that situation is no longer a problem.
I have not flown all the AH aircraft, but you might try the Italian 202 or 205...they seem to be pretty forgiving aicraft to fly. Other readers can give you additional tips.
The 202/205 should not require much, if any, rudder in the takeoff roll...so leave the rudder alone in these aircraft. Now let's talk about pitch control. I suggest you try not making any pitch inputs until your plane is over 100mph and you see the nose lower. Do not try to force the aircraft off the ground below 100mph...let it accelerate on its own and you will find that it will want to fly itself off!
Be prepared for a long takeoff roll...until you get some experience in the sim, let your aircraft accelerate down the runway...let the nose lower on its own...and then gently bring the stick back slowly to get airborne.
Once airborne and accelerating, raise your gear and trim out the pitch, aileron, and rudder takeoff settings using the keyboard keys or your stick if you can program it. Look at the trim meter on the instrument panel and put the red trim lines in the middle (neutral) position. To check your trim settings, release the stick and see if your plane wants to climb or descend, or roll one way or the other. If it does, use the trim keys to stop that movement.
Also check your turn and slip indicator to make sure the rudder is trimmed neutral...the little ball will be right or left of the middle position if rudder trim is needed. If the ball is left, use left rudder trim to bring it back to the middle...and vice versa for the right.
Then go flying and enjoy this really neat sim!!
Andy