How "homemade" do you want to get?
From scratch would include making your own tortillas first. Here's a good one for making whole wheat, but you can also make corn--get a bag of Masa Harina and the instructions will be on the bag:
Ingredients
* 1 cup all-purpose flour
* 4 cups whole wheat bread flour
* 1/2 cup shortening
* 2 teaspoons salt
* 1 1/2 cups boiling water
* all-purpose flour for rolling
Directions
1. In a large bowl, stir together 1 cup all-purpose flour, the whole wheat flour, and salt. Rub in the shortening by hand until the mixture is the texture of oatmeal. Make a well in the center, and pour in the boiling water. Mix with a fork until all of the water is evenly incorporated. Sprinkle with a bit of additional flour, and knead until the dough does not stick to your fingers. The dough should be smooth.
2. Make balls the size of golf balls, about 2 ounces each. Place them on a tray, and cover with a cloth. Let stand for at least 1 hour, or up to 8 hours.
3. Heat a griddle or large frying pan over high heat. On a lightly floured surface, roll out a tortilla to your preferred thinness. Fry one at a time. Place on the griddle for 10 seconds, as soon as you see a bubble on the top, flip the tortilla over. Let it cook for about 30 seconds, then flip and cook the other side for another 30 seconds. Roll out the next tortilla while you wait for that one to cook. Repeat until all of the balls have been cooked. Tortillas can be refrigerated or frozen.
Mostly homemade is easy--take tortillas (corn or flour, homemade or store bought), cut them into wedges, toss with a little vegetable oil (put in ziploc bag, drizzle in oil, toss), spread out on a cookie sheet, season (salt for sure, lime and garlic if you like) and bake at 400 for 10 minutes or until crisp and golden, flipping once.
You can also deep fry them (@ 350 for 2-4 minutes), but baking is much easier and healthier.
