Take a can or jar about the size of the pot you want to make and wrap strips of newspaper around it. Make sure the paper strips are long enough to go around the form several times and wide enough to hang over the bottom. Wrap paper around form tuck the hang over in towards the bottom of the form, overlapping and press all around. Staple seam to keep from unraveling and set in pan/tray before filling with soil and seeds. When ready to transplant just put in whole as is. The paper will decompose very quickly.
It's not the recipe for papier mache-you'd need glue or starch or something as well. Using newspaper for disposable pots is a great idea, but I'd steer away from using anything metal, like staples. Stay totally biodegradable if you can, who cares if your pot falls apart a bit!
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