you can either just create one in a text widget, or you can use this plugin. http://guff.szub.net/2005/01/31/get-author-profile/
You will need to fill out the author information on your profile.
Or you can just use profile pic plugin, it automates the whole process.
Use the shortcodes [printprofile] and / or [printprofilepic] within posts/pages, or the widget for a sidebar profile. Also comes with a bunch of template tags and an example author template.
