Jumping is where people's opinions differ, I start earlyish albeit just a small bit wood across the door to where their meal is, that's it get the seed planted then gradually build it up, then I'll use a sheep fence with an old bit carpet over it, I find they are more confident jumping something of solid stature, I'll get them jumping the same fence, once or twice a time and return to the same fence to continue training then as the confidence grows, do away with the carpet and eventually any fence then it's second nature to them,
As said everyone's different, maybe I don't need to do it t