Tape all four sides of your canvas. This prevents the canvas from ravelling and the threads from snagging on the edges. With such a small piece you can easily hold it in hand if you do not have a stretcher bar 6 x 6 . 3. The lines on the canvas are called mesh. We count the mesh to determine the stitch shape.
Every stitch covers so many mesh.
The mesh represents the lines on your chart. So what you see on your chart is what you stitch. Thread length should be 30 inches. If you use less you are stopping and starting more often. Use more and the thread starts to break down.