I consider myself highly organized but for some reason I struggled initially with managing all the simultaneous projects I had in residency. I recommend establishing an organization system right away.
Take responsibility for having a good experience. If you need more feedback, say so. If you need more guidance, ask for it. Don't put everything on your site, remember you are an employee.
Network as much as possible. Get business cards and emails and write notes to yourself about the person. I credit much of my success with getting to know people who could help me. And you can be a resource for them as well.
Remember that everyone you meet is afraid of something, loves something and has lost something. ~H. Jackson Brown, Jr.