If you are part of a team, you will meet your manager, someone you will work with on a daily basis. This is a good time to ask them questions about your responsibilities and what they expect of you. They will help you settle in and maybe sort out things like computer logins, email access etc.
Once you’re up and running, your line manager will run through some work with you and get you started on something. Don’t be afraid to ask questions at this point so you can familiarise yourself with your duties and how the company does things.