Texas is good. Bigger properties w/ more units is a little vague, but once you start getting over $20 million you are competing with institutional money and will have a tough time cash flowing. If bigger is something larger than a 4 plex, you will find properties that cash flow in several different areas. Management of properties outside of your local area will be one of the bigger obstacles to overcome.

The best thing you can do is get tied in with some local real estate investors, find a few RE blogs and podcasts. Sites like biggerpockets, podcasts from Jason Hartman and books by Robert Kiyosaki are good starting places if you don't know much about real estate investing yet.