the only real thing you need to watch is your speed
all you need to do is fly to the base, and get your speed down with some turns. once you get below 180 put your flaps down, and as you turn to the runway, put your gear down. you might want to raise your view with the page up key, just to get a better view of the runway. come in at a comfortable speed. i prefer about 120-130mph, flaps fully down, gear out
use rudder to keep yourself straight, as at low speeds the engine will cause you to drift a little, so keep an ey on the runway. use throttle as needed, and just be gentle.
as you're learning to do it, try setting up a landing a little further out than you think you need, just to give you time to line up. be gentle, and pull back slightly on the stick when your wheels are about to touch down, to 'flare' the plane, so that you land on all of the wheels, and slow down a little more. cut all power and apply brakes, (spacebar for both, c for lef6t wheel, v for right wheel, or if you have a rudder on your stick, use that, just to keep yourself on the concrete as you slow down.
make sure you are on the crete, and click tower, et voila:aok