Since this guy is looking to increase his vertical jump, just lifting heavier weights alone is not going to help. Jumping involves alot of fast twitch fibers. A plyometric program I used was very much aerobic in nature with no weight other than body weight.
I made 3 wooden boxes with hts of 12", 18" and 24". Place the boxes on a non-slip surface (carpet or rubber floor) and space them out. You'll stand with both feet together and just jump straight up, landing with both feet flat on the box together. Pause, jump down, pause, jump up to next box, down, up on last box. I usually line the boxes from lowest to highest.
For starters just go through the boxes like that and start back over with the lowest box again. Do that for like 3-5 minutes, rest and repeat.
You can also go low to high boxes but then turn around and go through the line high boxes to low.
Weight wise, the olympic lifts (power cleans etc) are good because they are explosive movements.
I'm not a huge guy (yet) but I do know a few things about jumping and volleyball.