Oh hey, I'm in the same boat
I'm in the process of teaching my horse how to jump and am re-learning myself (I jumped when I first started taking lessons about 6 years ago, but I've really forgotten most of it; I do have a much better understanding of flat work now, so hopefully I won't be too awful at it!)
My dressage trainer helped me get started with the ground work necessary- this page is pretty similar to a lot of the exercises I've been doing with my horse on the lunge line: Lorien Stable - Training a Horse to Jump
My horse has a pretty good grasp on jumping on the lunge line now (a requirement before you try jumping while mounted), and I've been practicing my two-point as well as doing mock jumps (just ground poles between jump standards)
This weekend I'll be going to my first actual
jumping lesson (with a jumping trainer) and doing my first jumps while riding. I'm definitely looking forward to it!
I'm also finding "Hunter Seat Equitation" by George Morris to be a good resource.
One thing I'm trying hard to focus on is not pushing my horse too hard, too fast and making it a good experience for him. I want jumping to be a fun change of pace for him, not a chore.