Wasteland has its own unique queueing system to ensure fairness for players attempting to connect to the server. There is a 30 minute priority bypass for members with the Donator Status. This allows people who support the server to get a slight headstart during the busiest hours on Wasteland.

That's okay! It will keep your place. Just re-open the website and go back to the Server Queue.
No, you have 5 minutes after disconnecting for any reason to rejoin. After 5 minutes, your slot is lost.
Yes, donators and Staff get a 30 minute head start in the queue. This means you will be placed ahead of anyone else who queued in the past 30 minutes who does not also have priority.
In theory yes. Given the 5 minute timeout for disconnects, it should let everyone who was on before reboot a chance to get in the in-game queue before that timeout. It is a good idea to go to the queue page and extend your time limit by five minutes. Occasionally, a reboot may take longer than five minutes.
Slot hoarding is the act of connecting to the server, but sitting at the "Click to Start" screen in order to hold your place without playing. Remaining idle on this page for 15 minutes or more will cost you your spot on the server. Additionally, you will be unable to reconnect for 15 minutes.
If you attempt to reconnect before the 15 minutes is up, it will restart the timer, making you wait longer.