you spawn in the spawn room somewhere underground and there are 4 coloured corners surrounding you.
You can pick which team to become by standing on the pressure plate of the corresponding colour, you will then be teleported to the ship of your choice where you can prepare for battle.
The limit of players per team is up to around 20 as there is a large amount of resources on each ship however be warned as these ships are not that large and so cant host all 20 people comfortably if you like a lot of space between team members.
In the middle of the map there is a mountain spire with an oasis on top where you can find chests with better gear that what's available on the ships and one particularly good chest on the small island guarded by Buford and Fanchesca.
There are also orange hot air balloons in-between the ships with some special items on them, so get them quick before other teams do!
(you can play this map without the mods already in it as they provide no addition to gameplay but if you want spinning propellers at the back of the airships then use the create mod with this world)
(create mod can be found on curse forge in mods, I do not own this mod nor did I help make it)