Before you can deploy your supabase project, you must have a few things done.
In general, you can follow the official guide for up to date info.
supabase login
You can get your project ID on the Settings page of your project. To finish this, you'll need the database password you input when creating your project.
supabase link --project-ref <project-id>
You'll need your database password for this step too.
supabase db push