First thing first, try to identify if the elbow problem is going to affect your natural swing; if it does work on adjust your swing.
Secondly, forget jumping till you have your upper body sorted first. You need to make sure you have the fundamentals in contact, correct pronation, correct ball toss before you start getting your feet evolved.
Isolate what you need to learn and practice, start from the ground up with feet position, then move to shoulder / arm / rotation, than move back to feet. Integration of "jumping" as you call it naturally comes last.