Select your audience by choosing which static lists are to be included in the campaign. Then select your template. Extend the options and under "When to Send" select "When Contact is Added to Audience". Then there are options for scheduling when the email is sent. Once the campaign is saved, it is Active. You can always edit any Automation Campaign.
Automation Campaign: When Contact Is Added To Audience
Setup a campaign that automatically sends emails to contacts after being added to lists.