All you need is masa harina and water.
It comes in a bag, like flour or, if you're really hardcore, you can make your own. http://www.gourmetsleuth.com/Articles/Homemade-640/make-masa-nixtamal.aspx
Use your hands or a tortilla press to shape them.
I never make them -I'm spoiled by having corn tortillarias on every other block, but w do use Maseca for pancakes, tamales, gorditas ...
I like Corn tortillas (gluten free) , thanks.