There's a book called 101 Jumping Exercises, it is an excellent
book to help start along a horse with jumping. It has exercises that start from the very beginning (ground poles) to the very "end" (actual jumps). Each exercise focuses on something different. Distances, bending, widths, etc. Even if you never get the ground pole stage at least you'll have different exercises to work him on. And it's very
in-depth. It will tell you how you should ride a certain exercise or how your horse should go with illustrations.