For starters get rid of the Assualt Rifle. Overall it is a one situation gun and unless you plan on crouching in close quarter combat situations then you will die a lot.
Use your grenades a lot. Grenades will automatically take down there armor.
If you feel like using the noob combo go for it. Charge you plasma pistol shoot someone change to your BR/DMR shoot one time to the head. BTW always aim for the head.
Crouching is very imprtant. I always prefer to stay off of peoples radar. Most of the time I always get the first shot off.
Stay with your team mates and try not to get double teamed.
Always pay attention to your radar
Anyways this list goes on but at least get use to the basics first.
My K/D is 2.06 and my W/L is above a 2.0 with randoms so I do know what I'm doing.
