Psychology today has a therapist search – you can filter by a n umber of specifiers such as insurance, specialty and location: https://www.psychologytoday.com/us

Breakdown of different types of therapists: https://www.talkspace.com/blog/the-different-types-of-therapists-and-counselors-the-complete-guide/

Evidence based treatments for PTSD: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5126802/