Are you also new to backend development, database schema design, and devops?
You might look at something like Prisma or Hasura than helps you build a lot of this out.
If you make it this far, you realize tech is not the real problem. Is actually business, sales, and generally understanding problems and communicating solutions so you are building something people actually want.
Hence sibling comment to get a minimal thing out to validate your market hypothesis. Have you dug into startup literature?