Use the controller scheme that feels most comfortable to you, play regularly but not too much, get decent amount of sleep so your head is clear for every game, practice your tactics and stick with the ones you are best at, and last but not least, get a good team behind you. Whether you join a clan or just get a small group of people/mates whatever, it will really help if you get a good team to support you and it will hone your team player skills, heightening your overall skill and playing flexibility :P