Each school district will probably have a website with job openings listed and any local requirements. As for state wide, these might help or have useful links:
- www.tsta.org - Texas State Teachers Assoc. (teachers union)
- www.sbec.state.tx.us (broken link) - State Board for Educator Certification
- www.tea.state.tx.us - Texas Education Agency
Btw, finding that 'perfect' job may take some time. Most high school coaching jobs are fairly sought after positions, so many coaches start in middle school/jr high positions and move up, or start out as assitants. For lots of information on Texas athletics, check out the Univeristy Interscholastic League website:
This body governs all public school competition, basically.