Phyllo dough can be found in the frozen pie section of your local supermarket. I recommend thawing the dough in the refrigerator prior to handling, if you thaw at room temperature you may have a problem with the delicate sheets tearing or sticking together.
Working with a package of dough at a time, unroll onto a cutting board. Use the bottom of an 8in cake pan as a template for cutting uniform circles out of the stack. Place circles on a damp cloth and keep covered. This will prevent the dough from tearing as you work with it.