Hi Andrew,
A warm up campaign can make sense for a new account as it can trigger the verification process. Then, you can complete it and start running real campaigns with a verified account.
A warm up campaign can be just a “like” campaign for one of your fan pages. You don’t even need to set up the campaign from the ads manager, you can go to your fan page and there you’ll find a button to create a like campaign. You can click that button and follow the steps.
If you need any help, just let me know!
William