Bang, I had the same problem when I first got on here. I also flew MS Combat Flight Sim - Pacific, and dabbled in the Flight Sim flying Cessnas and helicopters. I really liked it because, as you said, it was user friendly. I actually signed up for Aces High back early in the year, April I think, but I got into the offline areas a couple of times, crashed, stalled, and basically kept putting it aside until I had time to really try and ask questions. I actually started flying here exclusively about a month ago.
You are on your way to the RIDE OF YOUR LIFE! Talk about getting hooked, my wife and I now talk about this like it's my personal little "addiction"...I just learned how to drive a tank in here, and I'm having a blast!
Anyway, to continue...regardless of the other input you're getting, you will need to do two major things to make the transition.
1. SLOW DOWN your movements. One quick stick move will send you spiralling into the ground. Wait for the plane to speed up. Pull the stick back more slowly. Roll more slowly. Combat Flight Sim was very forgiving. Aces High is much more realistic with torque, etc. so if you instinctively "yank" the stick (as I used to do with MS CFS), you go "flip-flop-crash!".
2. Although you are being told to turn OFF the "stall limiter", which is under Options > Flight, my suggestion is that you turn it ON until you get used to the way these planes fly, especially if you are in Offline area. Once you get the hang of it, you'll be able to turn it off and then you won't spin to the ground every time you get high enough to try to turn.
Seriously, I am The King of spinning myself into the ground. Reading in here, and in the general message boards, gives a LOT of good advice...keep reading.
Final comment...the "game" part of this is GREAT! Teams, objectives, there is a goal, a methodology (kill the town, kill the hangers and ack, get the troops landed, etc.) and there is a LOT more to do than just fly and shoot. There are vehicles, ships, missions, and a whole lot of team-related things that are not even in the main arenas. You have a HUGE opportunity in front of you, so don't give up!
Sincerely,
One addicted user