As of today (15-04-2019) we have opened 3 official game modes / maps.
These being: Survival - SkyBlock - Medieval
Survival and spawn have shared inventories / xp and so on.
Medieval has it's own Nether world, using the portals to get there.
Medieval is a roleplay game mode, which is boosted by plugins.
Such like: Mob Hunting - RPG plugin - Jobs Plugin - And many more.
Starting with skyblock is not hard at all!
Just use the command: /is
The GUI will show you the way around and the rest will be obvious.
Medieval is accessable via a portal near spawn (Guided by Signs and Holograms)
Survival is also accessable via a portal in spawn, near the huge tree.
More news coming soon!