>>389390112
Some guns/builds are locked behind DLC, the legacy collection is a good buy.
You don't need any DLC to play with us. But if you are new to Payday I recommend looking up builds for survivability etc.
If you are totally new, you will be on your back for the first few heists as a lvl 0 player. But the exp of 1 heist should make you lvl 40-50, where you can hold your own in the lobbies and have survivability.