How did you get started? Mmmm, my grandfather had me on horses by the age of 18 months. My father bought me my first horse at age 10, and I have had at least one horse except for the years of college and young married.
What materials and costs are involved? A horse, but it can be borrowed! I loan mine out all the time. A 10 year old neighbor girl is leasing (free - She just has to do the care.) one of my horses for the summer. Horses can be expensive or cheap, but the upkeep is a bit expensive. I have my own pasture and make my own hay. It still costs about $500/year per horse for vaccines, feed supplements and hoof trimming.
How does it bless you or others? Horses are my SANITY, but I do share this with others. My best friend keeps her two horses on my property for free, and then I have a riding partner. I share my horses with friends and family, and often pick up nieces and take them with horse camping. I do ride alone, but not often.
Links to other sites to help pursue the hobby: