Here's my suggestion. Go to the library and look through copies of Money and Kiplinger's Personal Finance magazines. Not all the articles will be of interest, but the ones that interest you will help you get up to speed in a hurry.
Go through about three years worth of issues reading the articles that get your attention. At that point you'll have an idea what specific areas you want to know more about - retirement planning, real estate, credit, etc. At that point you can look for some books on those topics.
Don't start with the books because you'll get bored too quickly since you are starting from scratch. A magazine article takes only 10 minutes to read, and it's easy enough to make a copy if one is particularly interesting.