Phase 4 studies are typically easier to recruit patients for, and conduct as a clinical research site. Novice sites and Investigators may be able to pad their CV's and experience by participating in these trials. Clinicaltrials.gov is free and lists thousands of non interventional trials.
Introducing a physician with no research experience to the world of clinical trials doesn't have to be difficult. One opening into the field of research is phase 4 studies, which are simple and require no experience.