Before the Coffee Gets Cold question

I am planning to open one, mainly with second-hand books. The books are going to be read by customers, so second-hand clean and like new condition will do. I am not a hoarder, so there would be books only I like or I think my customers would like. There are many places to source for second-hand books with very low costs. (I used "costs" instead of "prices" as often you would be offered a price to get a pile of books). Therefore with a small number of collection of books (let's say 100) would be good enough for a start.