If you're brand new, one of very best things you can do is fill out your profile and let people know who you are. A picture will help make that connection. With a complete profile you will often find that others will introduce themselves to you.
It's probably not a good sign that I've been stumped at setting up the profile completely, is it . Any idea what you do when you know which company you're going to join, but you haven't actually joined them yet?