I wouldn't try the La7 quite yet, it's really not a good plane for a beginner and you'd like be frustrated with it fairly quickly. Try a Spit V or Spit IX, both have very gentle handling and will allow you to progress on a familiar aircraft when you decide to go into the MA. Both Spits are very common in the MA because they are both pretty good.
A lot of stall problems are related to unfamiliarity with planes that had low thrust as compared to a modern jet. It takes a lot of time to replace energy, so extended turning will quickly put you in a position where you are slow and turning barely on the edge of stalling. There are techniques to avoid that that you will likely experience as you learn. I know when I first flew in AH I was amazed at how sluggish the planes felt, being unfamiliar with them, until I started to appreciate that everyone has the same issues and maneuvers can help extend your energy.
There are AH Trainers available in the TA and other people who can help you in there. When you log in, look for someone in the AH Training Corp or ask on the radio for help. I know in the evenings (North American time) that there is often someone there. Unfortunately, we can't be there all the time.
-Soda
AH Training Corp
The Assassins.