Before you start designing, I think you need to know exactly what you're doing and why you're doing it. The whole team needs to understand the reasons for the tasks and their goals, and the product manager is responsible for that. It would be problematic to do a whole design project on your own, let alone based on our current trends. I think the best solution is to go to syndicode.com and order services from them. These specialists know their business and will be able to help your product develop and look good.