Usage of your radar is normally a good source for finding enemy
craft. Looking in the distance of the battle screen is a more
succesful method, as you have a longer range here.
Catching enemy craft by surprise is a good way of getting the upper
hand on them.
Smaller enemies can be destroyed, by being run over at high speed.
Using this method will save using up missiles unecessarily.
Usage of mines (especially indoors) is a good way of destroying
any persuing enemy craft. They will continue along your path until
they meet a bitter end by manouvering over your mines.