Multiverse: How can I add a nether to a new world.

Hello, I am building a server in minecraft. I built the spawn area inside of sp and imported the world in the world with world edit. I also have many other worlds so not using the plugin is not an option.

Anyway
I would like to be able to link a nether and an end to the world. I would like it so that anyone can easily build a portal to the nether just like in vanilla. How do I set this up?

Also I worry for when people kill the enter dragon. I plan to re spawn it once a week, or when someone pays for it. Is their a way to easily do that without unblinking the worlds?

 

Assuming your world name is 'walrus':
/mv create walrus_nether NETHER
/mv create walrus_the_end END

To reset the End (and respawn the dragon as well) I'd suggest using Multiverse-Adventure