Lots and lots of flatwork, then move onto poles, make the poles into jumps, and then do lots of gridwork and related distances. Make sure to do a range of jumps such as oxers, sraights and crosses.
Start out with a pole in front of a tiny jump first, and then gradually make the jump larger. Use "X" shaped jumps by crossing over two poles.
i meant a pole in the ground one step away from the jump, after the horses are confident i also use that pole to teach them to jump closer or not to the fence
we young horses i always jump in trot with a pole on the ground, so they learn to jump, when i put them jumping in canter i still use the pole on the ground till they are comfortable enough