This might be in the wrong section but, I'm looking for ways to earn extra seen bucks..

Get some geldings and start showing them

You could also complete quests too

While it's fun to breed and sell, HEE at its core is a game about showing horses, so the best way to earn money is to do that. Buy some geldings, train them up and show them. There are numerous showing guides here on the forum that will help you along the way. This is the easiest and most reliable way to earn money when you're a newbie.

The only problem with training and show I g them, is that I can't figure out how to get my rider to train them!! XD

Have You paid your rider?

https://horseeden.com/forums.php?f=11&t=931

Make sure horses are fed, the rider is paid (can do from the rider's page), then Stable > Training Center to train. You can train 1x per week.