I guess starting with basic stuff like line drills and rudimentary hops is a good way to go. It will teach you to stay on the balls of the feet and be reactive, as in depend more on the relaxed way of jumping instead of muscling your way up. The emphasis should be on relaxation and speed, not height.
Remember Im a noob at jumping. Line drills Ill be able youtube right? Ruimentary hops would be something like pogos perhaps? I get the staying on your feet and relaxed jumping.