Marketing Agency Structure Assistance

I'm thinking of creating a studio or mini marketing agency specializing in an integrated system that transforms attention into trust and trust into business results. The goal is to build clear and consistent narratives that drive demand, trust, and market perception for small and medium-sized businesses. I'm looking for advice on how to structure an agency, the services, the necessary processes… any and all advice from someone experienced in the field is welcome. I believe others are looking for the same thing and that this post can help.