Step 1: Get a basketball!
To fill the basketball, you have a few choices:
1.) I cut two slits in the ball, making a triangular flap.
I then taped the flap back, and filled my ball with sand.
Closing a flap is a little messy, but I had intended on taping the ball anyway, so it made my filling quicker.
2.) You could use an awl or a drill to put a hole in one of the black stripes on the ball.
Fill the ball with a small funnel, and then patch with a radial tire patch kit.