I'm sure there are a lot of different ways to start the year...

this is how I have started my last 5 years or so: https://yearcompass.com

if you've got some time for reflection, I recommend it.

if you don't have it done by the end of the day, don't let that dissuade you from focussing your mind and finishing it before the end of the week... you'll thank yourself several times through the year as you get to reflect on your mindset at the year opening.