http://www.newsweek.com/call-duty-black-ops-4-weapon-loadout-guide-when-can-you-create-class-1167802

Some things may be different in Call of Duty Black Ops 4, but one thing that has certainly stayed the same is loadouts. Players can pick weapons, equipment, perks and other customizations before hitting the front lines. A good loadout is key to success.

You need to reach level 5 in multiplayer to create your own class Activision