Spar against good players. Lose, lose, lose some more and lose until you start competing. Thats the fastest way to get good. When i started out in iEra I sparred against one of the best players at the time about 115 times in a row. No joke. Got my butt whooped 115+ times, the guy loved it because it was free wins but by the time we were done I learned a lot and improved from a scrub to a half decent sparrer. Another thing you can do is practice with bad guns and pk/base without using heals like food to rely on.