One of the available touch types in Campaigns for Gmail is a Custom Task.  A Custom Task allows you to write yourself a reminder to take any kind of action you'd like.  When putting together your Campaign, write yourself a note on what action you want to take: do research, set up a google alert, social media outreach, send swag, etc. 

To take action on a Custom Task, you must go to the Campaigns tab of the Yesware sidebar.  If you've just added Manual tasks, don't forget to refresh the sidebar.  From there, select the to-do card for your Custom Task, take whatever action you've prescribed, and then click "Done" when complete.