The four tools and their jobs. Search Console sees Google’s side (searches, rankings, indexing). Tag Manager puts tracking code on your site. Analytics records what people do once they arrive. Ads pays to bring more of them.
One Google account to own it all. Use a business-owned account, not a personal or agency one, and add everyone else as users.
The setup order and why. Search Console → Tag Manager → Analytics → conversions → Ads.
A one-page inventory. Every account, its ID, who has admin access, and where the login lives.