Zac,
As a realtor in Houston, and someone who used to market to 3000 realtors a day for off market properties let me tell you it's not easy. You will have to do something to set yourself apart as an actual buyer with credibility.
if you want some real in-depth advice, feel free to reach out to me. I am also in Houston (Pearland).
The first recommendation i would say is find a good realtor (friend/family) who will give you access to their MLS. Learn how to search for Sold listings which were investment properties. Now, look at the listing agent on that property and call them directly. Mention the property that sold - and tell them you are looking for something similar. Have a POF/PAL letter ready as you need to stick out from the crowd (and there is a big one in Houston) calling these realtors every day.
Be completely honest with the realtor, tell them how you are purchasing the property and don't forget to follow up with the goods ones, that give you their time. There are a TON of people who should not be realtors. Don't waste your time on those.
In short - call realtors who have worked with investment properties recently - in an area you are familiar with or want to buy, look for the realtors who give you plenty of advice and are willing to chat and follow up. A deal will soon follow....