When you face Malak (the final boss) you will notice all of the Jedi just floating in the room. Attack Malak until there's a cut scene of him regaining his health. After that, go around the room and attack the floating Jedi with either "throw lightsaber" or "drain health" (or it's stronger version). Then attack Malak, and he won't be able to regain any health.
That's how I've always been able to defeat him, and as far as I know, there is no "one good build" (not without cheating anyway). However, there is a trick I learned for this game.
When you start a new game only level up once (on the Endar Spire) then don't level up until you are almost out of health (because you heal when you level up). Then once you get on Dantoine (no idea if that's spelled right) and you get your first powers, then that's when you level up all you can. That way, you can get more powers and might make the game a little easier. And a final note, I found it best to focus on your melee skills whenever you level up, just because I almost always use my lightsaber. You can work on your ranged attacks if you want, that's just how I always play.
If you need more help, or I just completely misunderstood the question, just say something.

Good Luck:)