Start by getting to a safe spot and checking for injuries. Always see a doctor...

https://www.expertlawfirm.com/what-to-do-after-a-car-accident-in-texas-a-step-by-step-legal-and-practical-guide/

Start by getting to a safe spot and checking for injuries. Always see a doctor right away to catch hidden harm. Call the police to file a report and take plenty of photos of the scene. Collect contact info from any witnesses