Let's start off with some basics, talk to the fight school pilot, he will give you your first ever mission should you chose to accept it, (every preset has one) to accept this mission target his ship by left clicking on him, click open communication (or hit C) and hit the first option (or simply tap 1) he will tell you how to fly, target objects, opening the comm links, requesting docking permission (i reccomend using autopilot for a while untill you get used to X3AP), firing your ship's main weapons aswell as loading and firing missiles.