I train mostly stock breeds, so mine is based on that. Training for me starts at day 1. Weanlings are expected to handle on the ground like a showmanship horse, tie, clip, bathe, trailer load, behave for the farrier, etc. As long yearlings they are sacked out, exposed to a light saddle, lightly lunged, bitted and some ground driving.
I start riding mine as long 2's and go lightly through that fall & winter, mainly walking & nailing the foundation and some light trot work. By the spring of their 3 yo year, they already neck rein, sidepass, know what whoa means and that it means now, move hips & shoulders independently, etc. Makes it very easy to add in the lope & progress to lead changes and more advanced maneuvers.
Life is like a camera. Focus on what's important, Capture the good times, Develop from the negatives and if things don't work out, Take another shot.