We have a training staff here which can help in just these situations. Please post or private message me your time zone and when you would be available, and I'll have a trainer contact you.
A lot of folks new to highly realistic flight models have trouble with the same things. The main component of the problem is speed. These planes need to be flying above a certain speed to be able to turn hard without stalling a wing and spinning. A good rule of thumb is that you should try to keep your plane flying at least 200 Mph if you are going to be maneuvering. Now you can still stall at this speed, and even higher speeds if you pull hard enough, but if you get over 200 Mph before you start to maneuver, it will make it less likely and you'll be able to turn harder without stalling.
The second component is G forces. Turning hard on the stick increases the G forces on the airplane, and changes the angle that your wings move through the air. At too high a G and too low a speed, that angle gets too great, and your wings will stall, causing a spin. To help you identify when this is likely to happen, you will hear a buzz, called the "stall horn". This is a sound that starts when you are close to stalling the plane, and gets louder as you enter a stall. If you start to hear that buzz, it means you need to ease pressure on the stick and not pull so hard. For the tightest possible turn you want to pull so that you can just barely hear that buzz.
There are some offline drones for you to shoot at. They are not bots, but they circle above each airfield when you play offline. You can grab your plane of choice, take off and climb to altitude, then practice shooting down these drones to get the feel of the plane and guns.
Is there any particular plane you would like to learn to fly well? It is best at first to learn one plane to start. Now some are easier or more competitive than others, but the most important thing is that you are interested in whatever plane you choose. We trainers can get you reasonably proficient in just about any plane you wish, although some will be more competitive than others for a new pilot.
