If you use a wall then you have to approach parallel to the wall. When you have your heights recorded, then you make up a jump card. The card has increments of two cms. The idea is to find a place to hang the card so that the bottom of the card reaches exactly at your maximum measurement as recorded in your test. Some athletes have put their cards up on car ports, on out side basketball backboards, on space on a gym wall or hanging from a high ceiling.
Next step is to purchase a good skipping rope.
Use a moderately stiff rope for best results. The length is correct if the rope reaches chest height from the ground, when doubled and pulled to full height. Skipping must be done on a soft surface to avoid leg stress. The programme must be done at least 4 days a week alternating between block jump and spike jump. For this reason it is a good idea to arrange a time that you can use consistently.