@MaryIsobelcongrats on your tortilla press. If you have not made them before, I find it tricky to get the right amount of hydration so they peel off the plastic used while pressing them. Somewhere here there is a thread on making your own and that’s where I found the perfect ratio. 300 grams Masa Herina and 400 grams of warm water with a pinch of salt. Mix and let sit for 20 min or so. I then use about 35 grams dough per tortilla.
Good luck. They are delicious.