I don't know if there are any 'How to..' books out there on currency collecting but there are a number of tips and advise on websites. The thing you should have is a "Standard Catalogue of United States Paper Money" printed by KP Publications. I am sure it can be found on Amazon and other places. It is like the the Chiprack or The Gaming Table, in that it list all the notes and values. It explaing grading anf how to grade. It is recognized by 99% of collectors. I would suggest you buy a copy befor you get in too deep. Collecting U.S. Paper Money can get DEEP into your wallet VERY FAST and you should be VERY CAREFUL!

GOOD LUCK!