Flycatch is much more to the point...Approach angle and air speed......Your air speed that you asked about is controled by elevator , The altitude is controled by throttle......If you are dropping too fast you add a few of clicks of throttle...If you already have your throttle set for landing and you are going too fast you ease back on the stick and let it settle in....As he suggests find yourself an instructor if you can and ask him to devote some time to touch and goes......