First off, cover the basics. You'll need names, email addresses, and the organization names of the referrer and referee. This will help you to identify who they are so you can track them in the sales process. From there, it's up to you.
Our forms are fully customizable, so you can add any question you like, and make use of our countless question types. You can use our free template as a starting point, and tailor it to suit your needs.