These are all questions for your attorney. They will be able to give you information and advice on all of your questions. The District Attorney's Office will file the charge against you. I don't think one month is an unreasonably long time for a case to be filed if you've bonded out.
Your attorney will be able to help you determine the best options for handling the case. Some courts are slower than others and depending on the charge and case load. As far as a case being expunged, your attorney will be able to answer that question.
The information provided does not constitute legal advice and is presented without any representation or warranty whatsoever, including as to the accuracy or completeness of the information. Always contact an attorney when seeking legal advice.
I am a criminal defense lawyer in Fort Worth, TX. The state has at least two years to file this theft charge against you. The first thing to look at is the value of the property to see if the value was over-estimated. If worth under $50, then it is automatically a class C misdemeanor. If you are between 17 and 21 with a clean record, there is a great program that could be available. You do not want any theft conviction. In my opinion a class B deferred probation is preferable to a class C conviction, because you may be able to hide the class B from the general public by filing a Non-disclosure motion, if you successfully complete probation. A class C conviction, could not be hidden. Talk to your lawyer about any programs and how they will effect your record.