This is the basis for your cross stitch. If you have longer rows of stitches, do only one stitch at a time and work through the row. When you have finished, go back and do the second stitch, either stitching the initial threads to the back or gluing them on with craft or fabric glue.
When you have finished a piece, want to change the colour or your thread has run out, you can either glue it back on or sew your end piece by running your thread under existing stitches several times. You can then cut off the ends that are too long.