How to do commissions properly so reviews can be left.

I currently have a commission page that is not set up as a store page. I have a form on there that collects details and then I email them an invoice through the system. The problem with this is that I can’t get reviews on my commissions. The only option I have found to counter this is to set up my commissions on a store page. However, the commissions are all quoted based on what the customer wants, I collect a deposit and then the rest of the fee after communication with the customer. How can I set up a sale like this and still have an option for a review?