Getting Started
Where's my Horse?
If you can't find your horse, use '/h l' to view your horses, then click on your horse, and do '/h tp here' to bring it to you, or simply '/h tp' to go to it. If you don't see any horses on your list, then sadly your horse has died. You can buy a new one from '/h market', where players sell their horses on the auction, or buy a new custom Build-A-Horse. The choice is yours.
All a Board(ing)!
So your horse is going to need a place to stay. Lots of players offer boarding for horses at reasonable prices, OR if you can afford it, you can buy a stall on your plot, and keep your horse there (See the Plot guides).
Food and Water
Horses, like you and I, need food and water to live, so it's a good idea to make sure your buddy has access to food/water where ever you decide to keep them. Food can come in the form of hay bales, or, hay nets stocked with food from '/h market'. You can obtain hay nets, and other misc blocks using the '/deco' command. Water comes in the form of well... water, but can also be obtained from cauldrons or water buckets from '/deco' that have water buckets inside them.
Medical Stuff
Your horse can get ill. So it's a good idea to get it vaccinated. Ask for a vet to come and vaccinate your horse to ensure your horse doesn't get really ill, bad things happen when horses get ill. If there's no Vets/Farriers/Dentists online, you can get one via your horse's interaction menu!
Shoes
Shoes give your horse a competitive advantage, so make sure you get your horse shod by a farrier! Ask for a farrier to shod your horse.
Tack & Equipment
Purchasing tack & equipment can give you a competitive advantage. You don't need it, but having it equiped on your horse, will make your horse less likely to rear or misbehave.