Correct confo can help, but I wouldn't worry to much, depending about what you want to do with him.
Jumping also depends on the horse and if they enjoy it, you can have them correct but still not enjoy it.
If you're only looking to do lower levels or start out with him, I'd take everything with a grain of salt. He's young, a good time to start out slow and small with trot poles/x rails and go from there.
See what he's like and how he take it all in. Get a good trainer if you're planning on teaching him to jump yourself, as a good start will make all the difference.