To start, you'll need Corn Masa, which can be found at most grocery stores. Follow the recipe on the packaging, 2 cups Corn Masa and 1 1/2 cups of water.
Line a tortilla press with a long strip of plastic wrap, enough to cover both the top lid and the bottom lid of the press. This is so that the dough doesn't stick to the press.
* This is the one tricky part - I've learned that it's best to place to ball closer to the inside of the press, since it will flatten out away from where the press comes together.