You set up a new dev team. What are the first things you would do to make things go as smoothly as possible?

Imagine you are setting up a new dev team. Either to your current company or to a new one.

What are the first things you would do to safeguard the quality of your day to day life? Those could be technical or more procedural like:

Setting up CI/CD, coding standards, remove technical debt, etc
Setting out a clear process the various recurring meetings, ground rules like "leave the meeting if it is not valuable to you", evaluation processes, 1-1s, etc