@Account Closed ,
I am just getting started in rehabbing and flipping myself and have recently made some good contacts that are doing exactly what you plan to do, flip houses in the $50k - 150k range. So I will regurgitate the advice that was given me. The price range you are looking at is definitely the bottom of the barrel to lower end in the Houston market.
1) The property is in a decent market but needs significant work. You will be competing against many other savvy flippers to purchase the property and will need significant cash on hand to complete the rehab.
2) The property is in a low cost area. You can easily put in more on rehab than the property will ever be worth. This is actually where my friend focuses his efforts, but knowing the neighborhood is very important. Make sure you will be able to move the property. Low cost typically means lower margins, so the speed of the rehab becomes even more critical.
3) In either case, deals are hard to find. MLS listings will get a lot of competition. You will need a flexible schedule to be able to look at properties and make your offer within hours of the listing. It is useful to have a generic offer to purchase on hand that can be filled out and submitted right away. Deals in this price range are mostly purchased in cash, so you will need the capital squared away.
4) Learn how to find deals outside of MLS.