To activate creative options: press F1 for debug mode than F2 for godmode and F3 for debug menu. Alternatively you can use chat debug commands.
The creative menu offers: lots of buttons that do specific actions (like teleport to specific spot or stop all ships), list with all ships for spawning and it also contains the list of all items for spawning.
I am not sure I understand the question. If you want to create a specific world you can do that via a mod, look in the Mods folder for the example.