@Don Van Nguyen If in the long term you want to take over property management, I would not outsource it in the beginning. You are going to learn a lot more by actually doing it than reading about it on the internet, and better to make mistakes when you have 1 house instead of 10. Property management is really pretty simple (it can be hard because at the end of the day you are dealing with people, but it is not complex). There are a ton of tools out there to advertise your property, collect rent, get leases signed, etc.
In DFW, a 1% rule rental ($100k house rents for $1k per month) is breakeven at best due to high property taxes, so you are going to have to do better than 1% to get any kind of cashflow. You are going to have to go pretty far outside the core of DFW to find the kind of houses you are looking for (1995 or newer, good schools, low crime, etc.) and still get any cash flow. I see you are in Wylie, so I would be looking in some of the smaller communities out that way - Royse City, Princeton, Farmersville, etc.