Why do you think they are overrated?
Before you can begin plyometric work it is definitely a must to have weightlifting experience.
You must learn how to squat. It simulates the bottom and middle point of a controlled jump. At the same time you are strengthening all the muscles in your body. Everything.
Stretch day and night. Believe it or not some people can gain inches off stretching alone! What do you think happens after muscle is gained?
I could not write out a routine for someone that I know nothing about. This is strictly the beginning. Trust me, some people never get to the beginning let alone the end.