There are two options that I like on this subject:
Aswath Damodaran teaches Value Investing and is considered very knowledgable. Find his pages at http://pages.stern.nyu.edu/~adamodar/
This can become a very complicated and time consuming undertaken through Mr Damodaran.

Another option is a book called "Warren Buffet Accounting Book: Reading Financial Statements for Value Investing". The writers of this book also have a blog at http://buffettsbooks.com/index.html which has some quick but very well written lessons. Hope this helps.