You want to use parchment paper, which allows air to flow through, not wax paper which is not air permeable and which may, under heat, transfer part of the wax coating to your food. Parchment paper should be available in your supermarket.

You want a dehydrator with a fan (so you don't have to rotate trays) and a thermostat. Meats need to be dried at a higher temperature than fruits and veggies. While you can get along without these conveniences (rotate the trays manually every couple of hours), they make life easier.

In the meantime, check the warranty on the one that died.

Also, do a search because this topic has come up before. Instructions on how to search are in the "sticky" post at the top of the "General Discussion" section of this forum.