What are some tips in getting better? What types of weapons? What strategies to use, etc... I'm going to be playing the shite out of this, so I don't want to suck.
The hardest thing is getting started in games like this. It all depends on finding the guns you are most comfortable with. People will say this gun is better than that one, this gun sucks, etc., but all of that is personal preference. While one person may hate a gun, someone else may find the best success with it.
If you play objective gameplay like Domination, go around the outside of the map instead of rushing to B to learn where people like to set up camp in certain spots that can overlook B. We like to rush B, but the teams I play on know where the gunfire will come from. Also, unless you are losing, don't triple cap on Domi. Spawns get messed up and you wind up losing more bases that way. You could use this same plan for Team Deathmatch since there will likely always be someone aiming down the sights on the open area just waiting for someone to come across.
Determining the guns that you like and the type of gamer you want to be (run and gunner, distance shooting, sniper) are the two things you want to figure out. Once you do that, success likely starts to follow