Dear abuhimd,
I would love to help you with your Lean/ Business Model Canvas!
In general, I conduct a 2-3 hour session with clients and lead them through the process of the first iteration of the canvas.
A fixed- price offer would thus fit better, as I charge this work on a fixed price basis. What kind of information have you already gathered for the canvas and how far along is the business model?
Please get in touch so I can provide you with previous work samples and furnish you with more details!
Best,
Ana