Update the date, time and timezone as prompted. Install the charged battery and power on the camera.Another step that can be taken parallel to battery charging is installation of the neck strap.Canon Digital Photo Pro and EOS Utility are the two apps I load.
A charged battery is needed for almost everything going forward. That there are so many setup options shows that not everyone is the same as me. The definition of 'perfect' in regards to T6i/T6s (750D/760D) setup is of course referring to my own preferences.