Umm equip the first perk that blocks enemy UAV and sentrys. Mannnnnny people use UAV so it definitely helps you if your invicible to their radar. I'd also recommend equipping the third perk that lets you see enemy equipment. That way you won't fall for their booby traps. Try to get a silenced gun ASAP to complete the package.
Mex, that's a PRO tip/class!

For a BEGINNER tip, I recommend Sleight of Hand and get Pro as soon as possible. With the lag we are experience right now, we are dishing out more bullets than we ever had. Sleight of Hand Pro allows for a quicker reload or quicker swap for your secondary weapon; essential in a laggy close quarter situation. It also allows you to pick up guns faster when you are running low on ammo. In my opinion, it's the perk of choice in Tier 1.