Okay, so here we are. Ready to "brief" your targets.
This step is really important to streamline the search, as you are attempting to very clearly articulate your vision for the manufacturer. The more specific you can be, the quicker you will get to sampling and production.
Linked here is a suggested outline. Depending on your product, you may or may not answer each of the questions. Just use this as a guide. Set aside some time to clear your mind and allow yourself to visualize your final product being used by the consumer. This will help you define core attributes including form (how it's made + aesthetic) and function (how it operates). The practice often leads to conceptualizing future iterations, as well. So be sure to capture those separately in preparation for explaining your longer term vision when in the interview process.
A few thought starters below as you dig into completing the Design Brief:
How would you...