Sales strategy for a crisis management tool

It's a venture we want to start in our company. At this point, we have one major customer. We are doing some market research, but we're convinced that there is a market. Therefore we would like to have a sales strategy to see if we can succeed.

What are we looking for:
- sales process
- sales model
- sales tactics/scripts ( lead generation, cold calling, outbound outreach,...)
- value prop
- buyer journey
- buyer persona
- ...