I just made Change of Address postcards for my mother/stepfather. I put all of the information on the front. My mom will hand address (I'd use labels) in the middle of the back. Postage stamp will go in the upper right of the address.
You probably could draw a vertical line on the back, put your message to the left, address to the right, and stamp in the upper right corner. Doesn't leave a lot of room. I believe you need to keep the upper and lower horizontal sections clear for the postmark and some other post office markings.
HTH,
~Gina
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