I discovered BiggerPockets when I started doing YouTube searches on the topic. 

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I'd suggest a Google search - I don't know TX but have to imagine a market of that size has similar operations.

Other than having our numbers ready, the title searched, and a purchase contract on hand, what type of advice can you seasoned purchasers pass along to us? 

Here's an except from a quick search I did:When Do Landlords Have To Return Security Deposits?

When I search there are some commercial NNN properties which are around or over $1MM with corporate guaranteed leases for atleast 10 years and goes up to 20 years (like Fast food Restaurant chains, Banks, medical offices etc).

A real estate course will help you do more learning than searching, which will save you a tremendous amount of time. 

Here are some recommendations for you:Find and connect with other BP members that are in your area: http://www.biggerpockets.com/meetSet up keyword alerts to be notified of the topics that interest you: http://www.biggerpockets.com/alertsRead Beginner’s Guide: http://www.biggerpockets.com/real-estate-investingIf you wish to tag someone in the conversation on the forum, type @ followed by their name and then select the name of that person which should appear below the comments box.

Dear All,I’m planning to invest in rental property and have a goal to build great portfolio over the next 10 years.I live in California , and still searching around to see where I could start with under 300k, using Brrrr.

You want both a title search and title insurance.