Try reading "101 Jumping Exercises for horse and rider" by Linda Allen and Dianna Dennis. It will tell you step by step how to train your horse starting with poles on the ground up to huge jumps. It has LOADS of pics and diagrams and it tells you what YOU as the rider need to be focusing on and why this lesson is important for horse and rider. Every lesson is a building block for the lessons to come. It ALSO has info an building your own jumps. It will give you a lot of info on the whys and the hows of jumping your horse. You can buy this book used off Amazon
for about 5.00 it's a great investment.
I live out in the sticks so I totally know what you mean about finding an instructor is hard if not almost impossible. There is ONE dressage coach listed in my whole state. I live in the boondocks of southern Mississippi and most folks out here ride western pleasure or western working horses. A lot of people use their horses for actual cattle work and you'll find a lot more cow horses than jumpers where I love LOL. I rode my English tacked mare to a rodeo and I thought their eyes were going to bugg out! You would have thought they had never seen a horse before!