JayleBreak

To answer your specific question, you will only be able to play when the server is "up". See https://www.dualthegame.com/en/server-status/ for the current schedule.

I'm a new player, but I've seen some impressive plans others have posted (forums, discord) on constructs they will build (imagine Jabba the Hutt's palace). I can see players visiting/exploring these constructs, but in practice they will be lifeless most of the time (like the districts during the last test). Having NPCs occuping these constructs will present to the visitor a richer feel, and if they are player programmed they will provide another avenue for creativity.

Survivor of EQ Landmark here.