Hi, and welcome to the game!

Currently the gangs tab on the game is empty, this is because the gangs feature hasn't been implemented yet. So the only way to really join a gang is basically to state which gang you plan on joining, contact the leader, and let them know that you are interested in joining. This way they will know to invite you once the feature is added in game.

It will also allow them to assign you to their gang in the Drugwars Discord server, so you can access a chat room that only your gang can view, which is good for planning purposes.

I don't know if new gangs will be worth it. I personally think the earlier the gang exists, the higher the chance it succeeds, but that brings up the question of "is it already too late for my gang to succeed?" Many of the big players have already joined gangs. Also, the developers said as of now, there will be no size limit on gangs. This means the more members are in one gang, the more powerful that gang is.

However, if they add a member limit later on, that would mean many gangs are too big, meaning more but smaller gangs will be necessary. This would mean smaller but established gangs (including Yakuza) would be ideal. If you start a gang now, I'm not sure how difficult it would to establish it.

Good luck and have fun in Drug Wars!