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Factions is competitive so your players would be more into the game, but there are a lot of factions servers out there already and it would be...
You could host a server from your home
I am chill. No need to worry
If its just for testing why don't you just get a free or a bad but cheap hosting? server.pro
Install multiverse core and do /mv import PvP
after than, you can teleport to it with /mv tp PvP
Buy a banner on MCM, pay youtubers, ect
Make an anti swear plugin
Advertise a bit. You need to get your server out there
So try using multiverse
Use the answer above but if you mean let other players warp to that world use /setwarp PvP using Essentials and players can warp to it with /warp PvP
Like you said, use a bukkit runnable. If you're looking for spoon feeding, look else where