Start a new job tomorrow – what's important?

Fresh hygiene, business casual wardrobe (including shoes), and most important a friendly smile.

Go around introduce myself to my new colleagues, have lunch with them and try to establish a social network as soon as possible.

Again go through your work duties with your supervisor, make sure you have all tools and accesses needed to complete them.

Confirm with HR on company rules, work hours, reporting lines (time sheets, sick-leave report) and if they have any onboarding process.

Quickly look through your work, collect as many questions and uncertainities as possible and ask your colleagues/supervisor.

Assert dominance as soon as possible /s

Always take notes on every meeting, even if it is only a 2 person meeting.

Look and smell good, smile, let them talk, provide a sentence or two to show you understand what they are explaining. good luck!

Just for an interesting spin: anybody have recommendations for first day of a FULLY REMOTE job?