Mario, you can only use the external view if the arena you are flying in has it enabled. To use the external view hit F3. To return to internal hit F1.
I suggest you to go Setup > keyboard, and see what is mapped to which keys. It is very helpful. It will tell you that you need to turn the engine on with the "e" key, and that you need to hit your throttle to speed the engine up or slow it down,, and that you need to hit your space or "c"/"v" to engage the wheel brakes.
You'll save yourself a lot of questions if you check the default keyboard mapping, first.