A large monitor and eye glasses.

magic bullet helps find the enemy .

Big monitor and low DPI setting on the mouse helps me a lot. With a wide screen I try not to move left and right to avoid giving my position away. I limit my movements so it's more of the enemy making the first move that gives them away, and the rest don't check their corners.

Communicate with your squad mates via voice chat, learn to use use proxy voice com to alert other squads that the enemy is nearby since some tend not to see them.

When you join a squad ask the squad leader if he or she needs anything to help the squad. Always be willing to volunteers for anythings since teamwork is key in this game.

Also, don't take on the commander role until you are level 50 or higher. In addition, don't be afraid to ask questions.