Im new to this and have a question

First off, Hello all!

Ok, I bought a Ricoh kr-5 super 2 from a yard sale, and would like to know where I can get more lenses for it. Im new to photography using film, but have a general understanding of film and shutter speed. I would also like to know what kind of K mount lenses would work with my camera. I have a 30-70. I want to take shots of running horses from like 70 feet away, and look close. any ideas?

You are going to need a zoom. I'd hazard a guess around the 300mm range.

After googling your camer model, it seems any manual focus K mount lens would fit your camera. There may be some in the For Sale forum, or alternatively, go to keh.com and check out their range. They have a very good reputation there.