Yes, you can most definitely use templates or stencils for designs. I keep a book of designs for reference and have a standard set of stencils in the common sizes.
Check your library for a book called Amish Quilt Designs (full size) by Gwen Marston and Joe Cunningham. This is a good basic reference to keep on your shelf. You can use a copy machine to make the designs larger or smaller.
Start with a sz 7 between needle and practice until your stitches are even then move up to a sz 9 or sz 11. Knot your thread on the end you cut from the spool and never use a piece longer than 16 or 18 inches at a time. Use bees wax on your thread or use a coated quilting thread. Use a slightly thicker weight thread than you would in a sewing machine.