These steps pretty much capture the design process, which is a continuous loop of feedback between the engineer (me) the client (you) and the manufacturer. Once these steps are satisfied, I can also assist you with the next level of effort, which would be things such as optimizing the retail packaging, assistance with any patents desired, approving the choice of manufacturer, inspecting their first-run production items, etc. I can even help with sales and distribution.
1) Conceptual design. Basic level design work to create 3D CAD models of all the parts and assemblies. Generate images and email them back to your for feedback.
2) Maturing the design. Based on your feedback, more detail is added to the 3D CAD models, enough information to begin discussions with manufacturers.
3) Get manufacturer’s feedback on how best to design the part, then revise the 3D CAD models to reflect design changes that will make the parts easier and cheaper to manufacture.
4) Make some prototypes, the first being merely function (and usually ugly!), while the last being a true representation of the production parts.
5) repeat steps 2 through 4, so that your design vision is constantly optimized within the manufacturing and design process.
6) Once the design is optimized for DFM, then final engineering documents are produced, both 3D CAD models as well as 2D dimensioned drawings. This is the documentation that the manufacturers need to actually produce the product. These documents can be sent to any manufacturer anywhere in the world for best price, delivery schedule, etc.