Startup providing services for gov – navigating OTAs

My friends and I started a company that provides a solution for government customers/contractors We already have interest from contractor friends, and one customer is allowing us to deploy our solution at their facility. Collectively, we have 15+ years of experience in the industry.

One government customer directly expressed interest and wants us to be a sub through an OTA. We’re currently researching the OTA process and still need to get registered in SAM.gov

For those who have been through this, is there anything else we should be considering or keeping in mind? Any advice would be greatly appreciated