How do I address the following (1) research design, (2) sample technique, (3) sample size, (4) criteria for inclusion in the study, (5) recruitment process, (6) data collection, (7) data analysis, and (8) validity and reliability in a single-subject research proposal?

The subject is a sexually exploited teen who is exhibiting risky behaviors and mental health concerns. The goal of the research proposal/plan is to determine if TF-CBT is an effective intervention to reduce these behaviors to promote improved overall health.