Congratulations on wanting to learn to quilt.
I teach sewing to 9 year olds to adult. Our first project on the machine is a potholder. One side is 4 rows of 4 squares 2-1/2" square. The other side is 2 rows of 2 squares 4-1/2" square. The purpose is to practice 1/4" seams. When all seams are 1/4", the two pieces will end up the same size. You could practice free motion quilting or stitch in the ditch on it, too. Good Luck!