Taking off is often a frustrating topic among beginners, but never fear, help is at hand. First let's talk about taking off, this in my opinion, is the easiest part of this guide. Taking off can sometimes change slightly from plane to plane but the main part of it remains the same. Follow these steps and feel that frustration ease away.
As with every flight, the first step is to switch the engine(s) on. The default key for this is normally 'i'. If the 'i' key doesn't work for you, check in the controls menu which, can be accessed under the escape menu. After starting the engines, the propellers should start to rotate. When you are ready to start moving. To start moving, you will need to crank the power up. 60% is a good speed to take off at (can be set with the '6' key). But before you do this, there are two important things that can help a successful takeoff. The first thing is the meter inside the cockpit that displays the angle of the plane, you are aiming to keep this at 180* (flat). The second thing is how to direct the airplane up the runway, by default keys for this are the 'z' and 'x' keys, try to keep the plane straight. As the airplane gets faster and faster, there should be signs of lift showing on the wings. When you are ready, gently press the down key on your keyboard. The plane should now be airborne (be it a couple feet). The next step is to press the 'g' key to retract the landing gears. Crank the power up to around 80% and well done you have successfully taken off! Now go do your bit for your country and take down some nasty enemy fighters!