A new job is an exciting and stressful time. Everything you will be doing is new - new responsibilities, new staff, new boss and you might even be in a new city or doing a new commute. It's tempting to just keep a low profile until you are comfortable in your new environment and with your new duties. But that's not necessarily the best thing to do. You want and need to make a good first impression so here are 5 things you must do in your new job.