The directions are on the package, basically it is just a five pound bag of Masa, just like a five pound bag of four is, and you take some of the Masa, and mix it with water, flatten it, and heat it on a skillet, flipping it back and fourth to get those little brown spots.
The pre-mixed Masa Harina in the refrigerated section of the grocery store, is supposed to be a little better.
I’ve made my own tortillas for years using Maseca brand Masa. I just more or less follow directions; I generally use 4 cups masa, a couple of pinches of salt, and warm water to make a soft but not sticky dough, sort of knead in a good size stainless steel bowl until it’s a nice ball, and then make balls first, not small ones. Big tortillas means less time cooking.
I have a tortilla press - tinned iron; I’ve seen different kinds. You have to put plastic on it or the dough sticks. I just slice a plastic produce bag so it’s an rectangle, and put part of it on the lower and part on the upper part of the tortilla press.
Press em, and cook on an ungreased cast iron frying pan I use for that purpose, I turn them once or twice, and put in a bun/tortilla warmer (a round flattish thing with a lid) lined with a clean dish towel. I butter them one by one, we used to eat them a lot until I found that Maseca probably uses GMO corn.
Now I have at least 2 buckets of masa and need to figure out if it really is GMO corn or not.