Here is the build I use for my dps juggernaught. kills things really quickly.
http://www.torhead.com/skill-calc#101MMZcGMRrhddGRZMz.2
also, as mentioned above, use Quinn and keep him geared. he will literally save your life. Before jumping into any fights, make sure you have full health by using channel rage to regen. don't be afraid to blow your cooldowns if you get into trouble. For starters, get in the habit of using some of your cooldowns when you hit 50% health. look up some info on your class in the class forums and find a good rotation of your abilities. practice it. once you get good at it, you will probably start being able to lay off your cooldowns and be a bit more brash with your fighting.
good luck.