exrider:
You are not going to get book value from a dealer for anything. I have a closet full of baseball cards with a book value in the thousands. I MIGHT be able to get 20 cents on the dollar for them. In many cases, especially with common stuff (cards, stamps, matchovers, coins etc...) froma delaer you will get no bid at all !

Value is a relative concept. I have certain matchcovers advertising old time things like hotel rooms (with radio even), for $2.00 a night. Candy bars, and soft drinks for 5 cents, 1939 Worlds Fair, WWII matchcovers will drawings of Hitler and Tojo on them etc...
What are they worth? Only a buck or two apiece (according to the book). They are certainly worth a lot more than that to me!
Others will weigh in on this I'm sure. My advice is to start real slow. Don't spend any serious money until you have read a lot! Do some roll searching. (Check the penny and nickel threads on this site). You can still find some coins of worth for no more than face value! All nickels, and some Lincoln cents (1982 and older), are worth more than face value in metal content alone.
If you get into roll searching (especially Lincoln cents), you are going to discover many opportunities to purchase for 1 cent only - something that has a metal content of 3 cents. If you add wheat cents, errors, die varieties, RPM's, double dates and Mint state cents to your target list - your going to have MANY targets of opportunity. Your downside risk is nothing - because the cent will always be worth at least a cent.

This site has many experts who can advise further. Definitely consult their opinion and knowledge base before spending real money on any coin!