Suzanne,
I am NOT an attorney and am NOT giving you legal advice. That said, why are you doing a series LLC? For the beginning investor, a standard LLC is almost always the solution of choice. Series LLC's are great if you are doing high transaction volume. Most new investors don't do that right out of the box.
I sugest you talk to an attorney, but then TALK TO A CPA. The attorney's job is to scare you to the point you never leave your home and don't do an business. You might use what they have to offer once or twice in your career. You WILL use what a CPA tells you either yearly or quarterly.
What I recommend to my students is to talk to an attorney who understands Real Estate Investment, then talk to a CPA who REALLY understands it.
As for filing your own single member LLC it is very easy to incorporate an LLC in Texas. Google Texas SOS Direct and it will take you to the website for the Texas Secretary of State (where you file the incorporation). Most of what an attorney is going to offer you (i.e. operating agreement) has the most value if your situatiion involves more than a single member.
Let me know if there is something else I can do to help you.
-Greg Wilson (The REI Mentor - www.reimentor.com)