Shelly, if you are getting the gotta have it all package, and the tables, and the stand, I don't think there is much else you would need.
I don't recall hearing any one talk about cutting polymer clay with the machine, but I'm sure it could be done, as long as you roll the clay out thin enough
to fit under the blade, and I would make sure that you don't put it where the rollers would go. I think the "stickiness" of the clay and the mat would keep it from moving on you, but it is probably something you will have
to experiment with
to get the right force, and speed for what you want
to cut.