Horses??????

We are considering getting a horse next summer. But first my dad wants us to learn everything about them, and he wants us to take a six weeks spring riding lessons. How much do most places charge for lessons? I also need to know what kind of horses are good with children and teens. What are some of the supplies that are must haves? How many acres do you need for a horse? Is a horse hard to care for? Do you need to care for them everyday ( cleaning stalls, feeding, and watering )? Please help. Also if anyone knows a good horse website please let me know.