Who are the target customers?
What is their problem?
Have difficulties standing up for themselves and pushing back on client demands
What is your solution?
A tool to analyze quoted projects and give suggestions based on time spent on revisions, etc
How quickly can you build a MVP?
Who are the existing competitors?
Big project management tools
How will your first 100 customers find your solution?
Via content marketing, freelance forums, quora
How will customers pay for the soution?
Sponsorship from freelance platforms
How do you deal with copies of your solution?
Network effect, niche market
Am I the right person to build this?
Lastly, give your idea a name!