Apart from the conventional equipment, you need an emotional mouse to play a First Person Shooter (FPS). Comfort, control, and reliability are musts, if not emotion.
Sure, say "Bro, I got a mouse." Is a gaming mouse necessary? I'd answer, "Absolutely yes!" It's the most important thing, except mad skills, to win an FPS game.
FPS gaming mice are different from the office mouse you use all day on excel. Here are some FPS gaming mouse qualities to look for.
BenQ Zowie EC2- A
Razer Viper Ultimate Wireless
Logitech G pro-Wireless
Logitech G502 pro
Glorious Model D