You will need to pay special attention to your throat space. I looked up the Brother PQ1500s on line and the specs indicate your throat space is only 9". Most pantographs are larger than that so you will be limited in what is available for you to use. Same with plastic stencils. Unless they are a border design most are made to fit blocks so they are also bigger than what your throat space will allow when following the design with a laser light.

You can, of course, always drawout your own designs to accomodate the limited throat space or devise a way to quilt only half the design at a time.