In this place, you should get answers to most of your questions. If an important information is missing here, let us know on Discord!
What's the IP?
What's the Discord invite?
How to use the Nether Coords data pack?
When in Overworld: /trigger nc_inOverworld to get the Nether coords.
When in Nether: /trigger nc_inNether to get the Overworld coords.
How to toggle the Coords HUD?
How many players have to sleep to skip the night?
How to found a town?
1) Gather 3 citizens.
2) DM TxT on Discord with your town name, its location, mayor and citizens.
3) If you're not too close to another town, your town will be announced on Discord and you'll get a Dynmap marker.