[TheChaplain]

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.

[photonios]

This is it. I find that establishing a social network is one of the most important things to do in the first few weeks. It makes your work more enjoyable.