I would invest in a guidebook( Santi) to help you determine all of the above answers. If you are going to invest money in a collection you need to have more info and specifics about each book.The prices go from 1.00 to 300.00, all dependent on condition. I see so many overpriced books. I see so many 1.00 books selling for 20.00. Educating yourself is the best way not to overspend. I have collected 22 years and learned early that there are always more books out there.I have books of all shapes and sizes in my collection but that was my personal choice.Any collection is the pride of the owner. Do Not expect to make money on the collection and it will be fun.Please read the FAQs on this site to learn a little about the books. Questions are always welcome. Good luck and happy collecting!