First of all, get an NDA in place. Then discuss with the potential partner what type of resources they can provide you to assist with time to market and after launch. From resources to operations to marketing, etc; what is the overall sense of the partnership.
Ensure that the partnership you are getting into is not interfering into your core development process . However a constructive feedback is always welcomed. While you tend to gain a lot in terms of leveraging the scale and reach, technical expertise of these networks , you should ensure that you are following the vision you have started with .