Punch commons when there’s a lot so you can stumble as much as possible instead of killing one and letting more take its place.
Pick mom if nobody else will, otherwise Evangelo is great for the free breakout and movement but you can pick anyone.
On melee your positioning is the unsung hero, being in the right place at the right time is the difference between feeling immortal and feeling pointless.
Learn to dodge damage as much as you can while protecting your team and keep your back to a wall or corner when you can so you only have to worry about what’s in front of you.
Have fun and be good to people in quickplay and you will make friends eventually. Stay away from grenade dupers and play with people that actually want to work as a team so everyone can have a great time.
Don’t take it too seriously, B4B is a very hard game and almost impossible on nightmare so stay curious and work on what’s in your control while the devs work on the bugs and other problems.