Verified answer

The best advice anyone will be able to give is to just play it. Know the routes people take and just be ready to kill them as soon as they come into your cross-hairs. You will start to get used to it and in no time, you'll be able to rack up more than 2 kills.

In my opinion I hate people that do what I'm about to say... But I would start camping. Sit in a corner and wait on people to pass, or just get better at the game in general. Look up videos on Youtube looking for strategies for Search and Destroy.