Go to the county courthouse, to the County Clerk's office. The Clerk maintains all of the deed records. You (or someone in the Clerk's office) can look up the deed in Deed Index books, which are alphabetically indexed by name of buyer (called the Direct Index books) and by the seller (called the Indirect or Reverse Index books). This will tell them them which record book (volume and page) contains the specific deed of your ancestor. They will then pull that book, and make you a copy of the deed. Cost in Texas is usually $1 per copy, and most deeds are only two or three pages. These same books index other records such as Liens, Mineral Leases,Deeds of Trust, etc. but the Clerk's office will not spend much time looking up things for you, unless you already have fairly specific information about the name and date and type of transaction. They will often explain how to look things up...then it's up to you to search.