How many passers
A three-person receive covers more court. A two-person receive hides an attacker. Pick one and place only those passers inside the seams. Everyone else stands where they will attack.
The target
The setter’s target is usually between zone 2 and the net, just off the right sideline for a right-side setter. Mark it. The pass arrow should aim there, not at the setter’s feet.
The server
Add the opposing server and the seam you expect them to hit. A note such as “short seam between 1 and 6” tells the passers what this drawing is for.