I recently started playing "Bed Wars" and I must say I am quite hooked. I have developed a strategy for 4v4v4v4, so here it is:
1) Get 24 iron
2) Purchase endstone
3) Cover your bed in 1 layer of endstone
4) Get more iron
5) Buy about 32 wool
6) Build a bridge to the nearest diamond island using the wool
7) Get enough diamonds to buy the "Iron Forge" team upgrade
8) Get MORE iron and gold
9) Buy iron armor and a fireball
10) When people are building bridges or walking across one fire the fireball where they are going to be on the bridge when the fireball reaches them making sure you are aiming for the bridge itself
11) Get more iron, buy another fire ball
12) Repeat step 10
13) keep repeating step 11 then step 10