What plane are you learning to fly with?
I recommend working your way up using twin-engine planes as this balances the engine torque and other forces causing you to rotate and turn on the runway.
For trimming, it differs between planes. Some planes cannot be trimmed in a live gime and you must set up your trim in test flight, save it with trim fixation and it will be automatically done. This represents the ground crew adjusting your trim tabs. This is the case for many german WWII props.
I cannot comment for jets inside Warthunder. However, fighter planes especially after Fly-By-Wire was invented are inherently unstable and their aerodynamic center and center of mass are very close and will likely be too difficult to fly without previous flight sim experience. It might be a good idea to muck around with propeller planes for a bit to learn on a more forgiving platform. The P-39 makes learning landings easier due to tricycle gear while the P-51 and F6F hellcat are in generally very forgiving.
I did most of my learning in the P-51 for Warthunder, although my first exposure to flight sims was KSP FAR
For the act of learning itself - you should do the new player tutorials but in sim mode. They helped me quite a bit!
Afterwards, muck around in test flight and try to shoot down balloons/AI bombers and stuff.
Finally, load a custom battle and try to hunt AI planes there and do some CAS on the howitzers and AAA.
For me, these controls feel just perfect:
The “Square” setting I found to be crucial. It helps you better separate rudder and aileron control over circle set-up.
Sensitivity is fairly low, and I use my mouse on a medium DPI setting.
Also, it’s a good idea to look at general aviation instructional videos for propeller planes. Learning how to keep your plane coordinted can help you avoid flat spins and get a decent bit of speed boost. Converesely, learning how to forward slip without stalling can help you rapidly lose altitude and speed for easier landings without a long lead.