Hi, my name is Christine. I've only broken a few horses but ride everyday and have worked for a few olympic eventers and showjumpers. i have found they are easiest to break in when the owner has done EVERYTHING with them.
So my suggestion would be teach him to lunge, only gently because you don't want him straining himself at this young age. get him used to voice commands and getting him used to a whip. obviously you don't want him so used to voice and whip that he ignores it but let him see that it's there and it has a purpose but that its not a nasty purpose. i would also put a saddle just on him and do the girth up. Walk him with it on. Thats all though, you don't want to be getting on him and you dont want to be doing to much to early. You'll be able to tell if he can cope with it.
I would also put him out with friends for a little while let him be a horse if you've got him in a stable. Make sure you can rug him up and that will be easier on the breaker when the time comes. Try to teach him to come to you in the field as well. The less time he needs to spend at the breaker the better.
It sounds like you've done a fine job with him already! Keep up the good job!
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