This is something you should be doing with a trainer. You don't know how to jump and your horse doesn't either. It's not safe to just give it a go and hope for the best. Even if your horse does know how to jump, you don't. It's still not safe and very easy to develop dangerous habits. Posted via Mobile Device
I heavily agree with DancingArabians. Jumping is no walk in the park. Get a trainer, you'll need one. Until you can get one, I would be watching videos of jumpers, reading critiques of other people, and piecing together what you should look like. That way, when you do get a trainer, you'll have an idea of what s/he wants.