How to install and set the theme:

Go to Edit -> Preferences -> Themes -> Click install and locate the xml file that I included. 

After installing the XML file, please click the drop down to the left of the "install" button and set it to the new theme :)

How to setup the startup file:

Open the startup blend file that I linked and go to File -> Defaults -> Save Startup File

Congrats you did it! I hope you guys like both the theme and startup file :)