Pony Club is a great program. I was part of it for a few years. They have some barn management and theory classes during the winter and riding lessons during the summer. It's very affordable and a lot of fun as well.
The lessons are usually roated between dressage lessons, jumping and cross country and you are placed in a group of your riding level. They also organize some fun shows and some competitions that can take part in which is how you will pass your pony club levels.
It really is a lot of fun. If you have the chance to go, regardless of your riding ability I would go and do it. Unfortunately for me, I'm now to old for them but would still definitely still be in it if I had the chance.