Educational SaaS Platform

am looking for help building a SaaS platform (in flutterflow and/or flutter and Supabase). The target clients are small trainning/educational institutions/organization in several by flavors- The first version (flavor) will be with basic functionalities. The clients are mostly informal institutions similar to education elementary that have training services, and their clients/users are mainly students/trainees (underage and adolescents) their parents pay for the monthly services - it will be offered as a subscription with a monthly charge based on a fixed + variable cost for the number of active clients (students).