A few comments on takeoff:
Your plane is veering to the left because of the torque effect from the engine.
At your first takeoff attempt, you had flaps deployed and tried to force takeoff too early. That resulted in a stalled condition and a crash.
In your second takeoff, you did not use flaps, which is the right thing to do. You don't need them unless you're taking off from a CV or sometimes with heavy bombers.
I noted that you engaged auto-angles (shift-x) after takeoff. Do not do that. Your plane will will at a fixed climbing angle with a complete disregard to airspeed. Your climb rate will be suboptimal at best, and you migh even crash.
If you are taking of manually (like you did), get some airspeed first (app. 200mph), then press alt-x for autoclimb. That will basically let your plane climb at best climbing speed (there are some exceptions, but you will learn about this much later). If you engage auto-climb too early, your plane will nose down to gain speed. No good idea if still close to the ground

Usually "auto-takeoff" is enabled by default (you can see it written in green across your screen). That means, your plane will take off automatically, you need only to apply full throttle. Auto-takeoff is immediately disabled if you move any controls.
If Auto-Takeoff is not enabled at all, check it settings: Options-Preferences-Flight