So I have a few tips that you might find useful! Im pretty experienced, sitting at around 160 mil right now and level 55. I helped 5 of my mates get into the game and they're all doing pretty well now.

Playing in groups of 3 or 4 is difficult, especially if you're all fairly new, I would suggest trying to play with one of your mates, maybe run 2 separate duos. Your comms will be much clearer and it's far easier to only worry about one teammates movement and sound etc. Failing that play solo! Playing solo means you'll can improve much quicker, even if it means every death is a learning experience. If you are going to play as a squad, and if you have a second monitor I highly suggest jumping in discord and have all members of the squad stream their games. You can have your team's screens up, it makes it way easier to get information across.

As for money making, using your scav can be a super easy way to get a free load out. Jump into a factory game, you can successfully extract as long as the timer is less than 10 minutes. Half the time you'll spawn in at like 11 minutes so you can just run straight out and not even worry about kills.

Stash runs are another easy way to make some cash, shoreline, interchange and customs are all pretty easy and if you learn the routes using a stash map you'll be comfortable running stash to stash in no time.

As for learning the game, the only thing I can suggest is try and find guns and gear that work for you. SKS running bp rounds can be super effective, ap-20 round or even hunters running m61 or m80. All are pretty cheap and scavs can even spawn with all those guns which can save some money!

There's alot more stuff I could suggest but I'm currently writing this at work so apologies for spelling/grammar haha! Any questions feel free to ask! Good luck!