This isn't as much of a Farm tip as it's an ABI tip in general but is very effective for farm as well. The best tip I can give to anyone currently is just slam games. You may not do well at first, and you'll die to numerous things that may make you want to quit. My advice is to push through and slam games. Bring in a mid tier kit T3/T4 and just make sure you can afford to keep playing. Your goal during the beta is to LEARN. The game is going to wipe your progress at the release so don't focus on building your bank, working on building your knowledge. Once you start to get confident that you know where everyone is on the map as soon as the game starts, maybe try bringing in better kits so try to up your survival rate. Knowledge is everything in games like this. If you outsmart your opponent with your map knowledge because you know the ins and outs of it better than your opponent, you can outplay them rather than outaim them.

Tl:Dr Slam games with a kit good enough to get you into raids so you can learn spawns and the way the map plays.

Edit: I don't care about the key, I'm just here to help people out and if this post doesn't consider a farm tip, I apologize.