Right then, when a business is being sold as leasehold, it means you will have a landlord and rent to pay, you are only buying the business bit.
When a business is being sold Freehold, it means you would be buying the building and business (no rent to pay! Possibly a big mortgage instead..lol)
Before you buy a biz, ask for a copy of the draft figures of the books. If you don't understand these, an accountant will be able to look at them for you and explain them to you.
Most of all, take your time and don't rush into anything.
Jayne