Do you need to surrender plates from another state?
Yes they are from another state.
They need to be surrendered to the state's DMV they are from then.
Will I get a refund once I surrender the plates?
It depends.  You need to go to registrations refunds for surrendered plates to get more information.
Do I need to surrender motorcycle plates also?
No you do not need to surrender motorcycle plates.
Can someone else turn in the plates for me?
Yes they can do that.  Just make sure that the person gives you the FS-6 receipt for your records.
Am I able to surrender my plates just temporarily?
Yes, you can do that.  You can look under special procedures to surrender plates for a season or temporary surrender of plates.
How are we notified that they were received if we mail them in?