1. Have two guns both cocked and ready

2. Take cover beheind a couch or something

3. Inside a house are some of the best ambush spots you can find.

4. Use a gun with a high RoF 

5. Stay low

6. try using stealth

7. be smart

8. dont waste your ammo

9. If someone fires a shot at you and they have a single shot gun charge them while they're reloding

10. Aim