I have four rental homes, and have had plenty of hard knocks, especially at the start. This market is perfectly set up for investment property as you can get 4.5% on investment property right now.....first time ever. Also with all the stipulations on mortgage loans now, it makes it very hard for young would be first time buyers whom are forced to rent now. Also take in consideration that when this eventually turns around, you will have some awesome equity in those properties. Now for the advice on books, I have none.
The best advice I can give is to "Screen your applicants" If they are slow on paying others, you will be the next victim. Also, buy a home near good schools as that is a very important selling point on rentals........Good luck, and if you can purchase Newer homes that demand less maintenance your one step ahead... Best wishes :0008