Initiating a Workflow From Sharepoint with a Form

I am trying to create a workflow that starts when someone updates/inserts a document into a Sharepoint library.
When the user inserts the document into the library, I would like a form to automatically pop up and have them enter a few fields of information, then begin the workflow.

I know how to start the workflow from updating/inserting a document into a SharePoint Document Library.
But does anyone know how to automatically pop up a form so the user can enter in some basic data before the workflow truly begins?