I have a gourd patch, pumpkin patch, and zucchini patch. Well. They are together. I'll comment on my spacing and/or possible spacing disaster in the future, that's another story, anyway:
1. What should I put under the pumpkin vines?
I think last year we used dead grass as mulch and that worked alright. When I grow Armenian cucumbers I put a little piece of cardboard underneath the fruits so they aren't touching the ground, but those grow so fast it barely matters...
2. What do you put between the pumpkins and the ground so it's not touching the ground?
My garden partner suggested buying straw, but I read about miscellaneous stray seeds possibly being in the hay or straw (admittedly I don't know the difference between hay or straw), and really don't want random plants brought in with whatever mulch we use.