Books might be helpful with general principles, but real estate is local. Real estate also changes rapidly of late. By the time a book was printed it'd be out of date.
Once you understand the basics,find a good local realtor who owns investment properties himself/herself and ask a lot of questions.The qualities you might look for are patience,because you will be asking a lot of questions, and knowledge of the local market.
You may also want to keep an eye out for local real estate seminars on real estate investing.Not the ones that want to sell you a "get rich quick" program,but local educational events that brings like minded people together. Meetup.com is a good place to find out about these meetings. I personally am a part of such a group.