Fill out my Pofile
Every avatar in Second Life has a profile. Profile let other avatars know a little about you before they talk to you, such as, what SL groups you belong to or places in SL you find interesting. You can access a person's profile by right clicking on the image of the person's avatar and selecting Profile from the menu. Torley Linden has an excellent video tutorial demonstrating how to fill out the profile for your avatar: