What are all the commands that the players can use in creative?

I am just wondering, like how do I spawn ships in plots I want to spawn in some ships to see if I can modify it and make it better.

Doing that isn’t allowed unless you have explicit permission from the ship’s owner; however you can reverse-engineer (i.e. opening it up to take a took at it and taking inspiration to build something from scratch) it.

/loadshopship [name]
(do /shopships [I think] to see ships or just do /loadshopship and press tab while still typing the command)
/blueprint load [name]

In other news, welcome to the forums!