Rick. I'm waiting to see how much acreage Tori has, and how much they can get tilled up in time to plant all those seedlings . . . Luckily it sounds like they are young and energetic.
Tori, by the time you get a greenhouse built, all those seedlings will need to be out in the garden anyway, Dig, kids, Dig!!!
Leave the greenhouse project for next winter. Unless you have space somewhere for one of the little plastic zip-up ones.