A user flow shows the steps a user takes to accomplish his or her goal. One way to start building wireframes is to write out each step (or item of functionality) that the user will encounter, and match it to key messages. The user flow goal worksheet and user flow sketch sheets can be printed, and used to physically create a user flow with a group working together.
The first step in creating a user flow (as a content strategist) is to think through the steps that will get a user to his or her goal. This worksheet will help organize initial thoughts and messaging.
Next, a content strategist (ideally alongside a designer) can sketch out the screens. For each screen, consider how many steps will take place, and what messages will be conveyed.