Self Hosting with Supabase - what are the next steps

I followed this guide in the supabase docs to get started with self-hosting. The issue is that the information is very limited. After telling you how to run Docker, open localhost, and create API keys, there’s no more instructions. I’m extremely new to this, the only database I’ve worked with is Firebase which is much simpler, so I don’t know the next steps. Are there any full guides?