First, choose the lightsaber color. Then, when the Sith attacks, use d to deflect and the space bar to attack. When the Sith drops a health power-up, click on it to get 10 more health points. If the Sith gets 5 more health than you have strength, you will lose one health point even if you deflect. When you attack a Sith, he randomly deflects, so you never no how much damage he will take.Every time you beat a Sith, another one five health points more powerful will come. Beat as many as possible. (If you can beat more then two, I'd be impressed.)
I may have gotten the idea from Starwars. Just maybe.