You can use store bought pizza dough, either by the tube- like pillsbury, or wegmans sells pizza parlor dough in the prepared foods section.
you want to roll it fairly thin- if you use a tube it will give you four calzones. Don't overfill. It's really tempting to but it doesn't come out well. Place your fillings in the lower two thirds and brush a little water on the bottom edge to seal. Snip or cut a couple small steam vents in the top, and bake. I like to put them on parchment paper to make clean up easy.
If you want to make veggie ones, don't put frozen veggies in there. Make sure you thaw and drain thoroughly. If using frozen spinach (yummy and healthy, just don't over do it.) thaw and wring out in a dish towel thoroughly. Don't forget to season veggies. Meats do not need to be salted.
at 10:18 PM on Feb. 25, 2009