Are there any rules of thumb for space and seating around a dining table?

For instance, how much space is needed behind a chair so it doesn't hit the wall when you pull it away from the table?

Also, what is a comfortable "overhang" for eating (amount of space between the table apron and the edge of the table top)? How many inches of space should I allow per chair along the length of the table?

I'm trying to figure out what type of table will work in my breakfast area and realize I don't quite know how to plan out this space!