Adding New User - Gmail Business Email

I’ve purchased a new user account for gmail business email. I skipped setting up initially. When I go to business email > show user info > set up user - the link is broken and I’m redirected to the main admin console in Gmail.

In the Gmail admin console, if I click ‘add a user,’ will I be billed a second time? What is the correct way to setup the user account after purchasing the account?