Najajo01

So my friends and I are planning on going to Northern Front this summer. This is my first milsim that I will be going to and I was wondering about the squads. My friends and I only make up 5 people and I saw on the rules that a squad makes up 12 people. What would happen about that? Would we be put with another squad to fill it up? Also I read about the different positions in the squads such as the sniper, or medic. My friends and I all just have casual AEGs, like AKs and M4s. Do we have to bring special guns like snipers and LMGs? Or will we be put with people who have them? Thank you!