I think the first few weeks the most important thing involves learning the company, people, business processes, etc...
Yeah, I could say "set up the computer and software" etc... But that's sort of a given... I think the more important thing has to do with the people and the business itself. Learning how the departments communicate, learning about how people relate to each other, etc.... Is a lot more important than the technical aspects... Every one of us can do the technical stuff alone in our bedrooms but a big part of working professionally at a company is the communication, business rules, and stuff like that.