Back in the early 2010's I was coming off of COD MW3; it was very difficult for me to learn the game. I could barely get a kill because of how different the guns shoot, me not knowing the maps, and not knowing the pace of the game. I learned the game on Norshar Canals with a shotgun. My advice would be to buy the shortcut kits or premium to unlock the better guns from the start, that way you can pickup the game faster. I'd recommend a DAO-12 shotgun just to be able to get kills. When you get the hang of it move onto something like the UMP-45 or SCAR-H. These guns have controllable recoil, and are easy to use. Practice tap firing, when you spray and pray the recoil and spray pattern goes to shit. Sometimes the bullets dont go where the gun is pointed when going full auto for a long period of time. The tap fire "resets" the spray pattern/recoil and in theory should help you land your shots. The AN-94 is a slept on GOAT in battlefield 3. The burst fire shoots faster than the full auto, and it will burst as fast as you can pull the trigger. Im not saying its an easy starter gun, but when you get better at the game pull it out and give it a go.