Shoeing: You should shoe your horse's feet every 4-6 weeks, specifically if you are riding them a lot or one of your horses has tender feet (horses who are lame, have white feet, etc.…) If they are more so just pasture decorations or companions, your horse's feet should be trimmed, this can also be in longer spurts than the 4-6 weeks. The shoes your horses have may differ depending on the horse's foot, age, use, and what the farrier may believe to be best.
When should you start your horse: If you are buying a young horse, especially from a seller, you are most likely buying a yearling. When the colt is still small, you want to get as many hands on as you can and start halter breaking it. It will be much easier to halter break a little guy rather than a two or a three-year-old. In the colts first and second year, groundwork is as much as you want to do because they are still too small to really ride yet. Their three-year-old year is the golden year. They are big enough to ride and if you did your diligence with your groundwork and a saddle, maybe a little round pen riding, they shouldn't freak on their first ride.
What should you be feeding your horse: Grass hay is efficient if its summer, but you should pair it with a heavy nutrient grain like equine senior to make sure your horses top line stays “full”. In winter an alfalfa/ grass mix is really god because it will put good weight on your horses. Alfalfa is good in summer to because it will help your horses stay sleek and shiny. If you have an older horse or a young one you may want to look at supplements or grains to help with whatever the horse is needing.