Be aware that Sites such as facebook, YouTube, etc are "blocked" by people who might browse websites from work.
Also - FYI - babies usually grow butt high - and don't level out or get wither high until they are done growing.
99% of people do NOT want stud colts - they want geldings. Geldings are more marketable than stallions and fillies.
Most people want horses (including babies) with basic skills like leading, tieing, standing still for farrier/vet, and bathing. Clipping is a nicety - when I sell babies they alwys leda well, tie well, have no farrier issues (they are resolved before I sell them), stand quietly for bathing and clipping - including ears.
As yearlings they stand quietly for blanketing/ saddle pad. I can place a saddle on their back and bridle (with bit) on their heads and lunge them (lightly - no more than 15 minutes max) left and right at walk, trot and canter. They can also load quietly into horse trailers.
If I have time they have been ponied in a pasture (and better yet on trails).
So training horses for the above basic skills will give these animals a "leg up" in the horse selling market. I.e. If you could buy 2 yearlings and one has these skills and the other does not many people will pay a bit more for the "trained" horse (which as babies you would only work with them for SHORT periods of time - say 15 minutes a day).
Dressage is for Trainers!