Manage my Search Marketing

I need market research, particularly finding quality keywords for a product in development. I need these before I develop this project too far so I know the slant to put into the copy for video and text and the particular target audience to address. The product is called "My Signature Storytelling" (I'm open to changing the name to support better keywords). It is a training and piece of software to guide clients through the process of writing script for their life story that could be formatted in a variety of ways (ebooks, audio, video, etc.). It can also be used as an aid add a personal story line to sell information products on other topics; In other words, personal testimonials explaining the reason the creator is passionate about their topic of interest. I know I'm doing this kind of backwards but I would like to find the closest niches to build this product around. There will be both faith (Christian) and non-faith-based versions, but for now, it's more important for me to focus on the wider audience. The product walks clients through a series of assessments to help them identify their life purpose as they work through the process of telling their story. It helps them recognize themes and patterns in their past and encourages them to translate difficult circumstance into purposeful contributions. So far my own research has not yielded much, so I'm hoping that someone who does this professionally might come up with some profitable niches (and subsequent keywords) that have alluded me to this point.