For tips on rolling, see this
wikiHow (But skip the part about foil).
You can freeze these before or after baking. To freeze before baking, wrap each individually and let thaw for 30 minutes at room temp before baking. If you freeze after baking, wrap each individually. I recommend thawing completely before baking so you don't overcook the tortilla.
Nutritional estimate uses a high fiber, lower calorie tortilla