Create Document Form is step in a workflow model that is a paired value of steps. Adding will automatically add the Fill Document step. 

In the Create Document Form step, reference a document that was previously uploaded to allow participants to add signature, date, or other fields in a Fill Document Form step. Choose the Property Name of the file upload step and participants will add fields. 

In the Fill Document Form step, assign to the email address field for the individual to complete the form added in the creation step. 

Consider adding email or other tasks as needed in between the create and fill steps.