The value of unpainted ceramics and an older kiln?

My friend just bought a house from an estate and with it came a shop full of ceramics of different kinds. There are many, many cermics, different sizes, different holidays, and they are all fired just not painted. My friend would like to sell them, but has no idea of their worth. She also has an older kiln that still works as it has fired all of these ceramics that I speak of. We are just hoping to get an approximate value of these items so she knows what to ask for them. She doesn't want to "rob" anyone, but she also doesn't want to get "robbed".