Congratulations, and welcome to BP! I have duplex's and had a fourplex that I sold. I agree with the previous comments about Indy's swings in value. My question would be: What is your long term goal? Do you have a passive income number you want to reach every month? Are you looking for a certain percentage or CAP rate? What are your 1 and 5 year investment goals? I think that has a lot to do with how you proceed. As Gary Keller, the founder of my company (Keller WIlliams) says... "begin with the end in mind." You need to be clear about what you want and where you are going.
In addition to the other books listed above, check out Keller Ink's FLIP and HOLD. They were written after the Millionnaire Real Estate investor, and the titles speak to the book's content. A former partner of mine was one of the primary authors of HOLD, and what she suggests in the books is what she does. She now has over 100 SFR's, 6 commercial buildings, etc. But she had her criteria and stuck with it. For example: I know she only buys 3+ bedrooms, 2+ baths, homes with brick, 2 car garages, buy 20% under market, put 20% down, make $__X___ per month passive, etc. Again, getting clear will help you there. Good luck!