1: If you deleted the world and can't find it, you don't have it. Not sure what you expected to happen after deleting it.
2: Servers can take from 30 seconds to 2 minutes to start, do /join <servername> in a lobby and it *should* automagiclly send you. If your still getting errors, please send your logs
3: I'm assuming you created this world through console, not multiverse right?