Look at AVVO under "The texas Divorce Process - From start to finish". It is a great article (pardon my bias, it was written by me, of course) that should give you a broad overview of the process. Then visit with a good lawyer to help you through the process.
p.s. the link is at http://www.avvo.com/legal-guides/ugc/the-texas-divorce-process---from-start-to-finish