Multiplayer tank battle

I have a concept for a multiplayer tank battle game also have located the exact toolkit from the unity asset store to use which would just require some additional features. would like a full register/login system chat room rank system leaderboards API this is a 4 vs 4 vs 4 vs 4 battle so each team has 3 players and a captain the objective to the game is to take out the other teams base with your teams bomb. offensive and defensive weapons defense weapons with simple AI for enemy firing graphics aren't an issue need functionality before artwork