My wife wants to extend our hardwood floors up the stairs and throughout the upstairs hall. We want to refinish the downstairs also, along with staining the wood a darker color such as cherry. The problem is, I don't know what the brand of the old floor is. It's about 17 years old, and I am not sure of the wood type. My question is, where do I start? And is it possible to do a pre-finished floor up the stairs and throughout he hall, then match the downstairs to that?