New MacOS Machine Setup
This guide is based on my own experience, but also draws on other guides. It is primarily oriented towards those doing code-related stuff (e.g., I'm mostly an SDET, but is also applicable to those doing either Python or Web-based development).
A couple of other examples:
Most of the setup will use the terminal. For more details on how to setup an awesome terminal experience on the Mac, see my guide Steps to Terminal Enlightenment on a Mac (tweaking your terminal for fun and profit), which in fact includes some of these steps (you're welcome!).