Conducting a documentary and need some help.

Hello, I’m a student studying psychology and I decided to make my school project about marriage tours. I want to study the behavior and benefits of individuals who attend such events. From the data I would gather from observing and researching up close, I can start making my documentary/project and hopefully land a passing grade. The only problem is, i don’t really know how these things go and where to start. I was thinking of interviewing some people who’ve attended these events before or either view online threads about their experiences or insights. Any suggestions?