You can see any/all recent campaign activity under Reports > Activity Stream. This is a real time list of ongoing activity in your account for all sent campaigns.
By going to Audience > Contacts, you can export, import, or add new contacts—as well as edit contact information. You can also filter contacts by status, list, segment, and/or tag. From Audience > Lists, you can view Audience Growth in the chart at the top, and you can create new lists. By