It's a good start! You might want to take a look into the books "Business Model Generation" and "Running Lean" (and follow-ups for both). The first one comes out of science and is the state of the art tool to reason about your business. The second roughly follows a similar approach but tries to be even more practical.

Both companies also provide digital tools and I'm thinking about building one, too. Hey, we can take this post as an early experiment and see if someone is interested!