Welcome!
I agree with Jayhawk and would also recommend getting a soil test done. I think it will provide some insight on what you are dealing with from a soil perspective, and go from there.
I'd also recommend searching for a generic bermuda grass care calendar that you can follow. It will (somewhat) take the guess work out of what to apply and when.
Here is a link to a calendar that Walter Reeves (aka the Georgia Gardener) published. Granted, it is more for the climate here in GA so applications months will vary in TX, but you get the idea.
http://www.walterreeves.com/uploads/bermudacal.pdf
I agree with Jayhawk and would also recommend getting a soil test done. I think it will provide some insight on what you are dealing with from a soil perspective, and go from there.
I'd also recommend searching for a generic bermuda grass care calendar that you can follow. It will (somewhat) take the guess work out of what to apply and when.
Here is a link to a calendar that Walter Reeves (aka the Georgia Gardener) published. Granted, it is more for the climate here in GA so applications months will vary in TX, but you get the idea.
http://www.walterreeves.com/uploads/bermudacal.pdf