Names, addresses and telephone numbers of other franchisees and a proper discussion with them about the entire business, the customer response and the company support.
Take proper advise on the franchise agreement.
A fully audited financial statement of the seller if they are a ltd company or a private ltd company. If any other format, request for the information.
The cost required starting and maintaining the business. Please make special note of working capital or ongoing costs which you may have to incur after starting the business.
The responsibilities you and the seller will share once you buy a franchise.
Litigation involving the company or its officers, if any.
Again, use your professional support to examine all of these issues. Some of the contract terms may be negotiable. Find out before you sign; otherwise, it will be too late.