Who are the target customers?
Freelancers new to freelancing
What is their problem?
They don't always know how to write a proposal that sales
What is your solution?
A library of proposals and a step by step proposal writing guide
How quickly can you build a MVP?
Who are the existing competitors?
Blogs, books, content marketing
How will your first 100 customers find your solution?
How will customers pay for the soution?
How do you deal with copies of your solution?
Am I the right person to build this?
Lastly, give your idea a name!