WHAT IS THE BEST ONLINE WEAPON TO USE AND WHAT PERKS SHOULD I USE ??

WHY NOT PLAY THE GAME AND FIND OUT

The game is meant to use weapons, perks, and attachments to accommodate for various play styles. You can't expect to do well just by imitating someone else. I agree with the above poster; play the game and find out what agrees with you. Oh, and fix your caps lock button.