We just recently purchased a business in December. Lock, stock and barrel.
It was an awards, trophy and engraving business. Fifteen years old.
Really nice fit for our existing sign shop.
I'll tell you what I had an eye on when I bought it.... if that'll help you sell your operation.
Accounts: I was interested in the quality of the account. (tons of schools, coaches, small and large businesses, how much they did annually, etc.)
Records: I was shown how the business keeps track of things. The awards and trophy business is a huge "you did it for us last year, here we are again type of business". So I wanted to see how things were archived, and of course the paper invoices, job orders, etc.
Inventory: How much of it, how current it is. (styles change and this kind of inventory can grow stale)
Equipment: Age and general condition. Is it top of the line or some obscure manufacturer?
Software: Wished I would have looked closer at this part. We ended up having to spend to upgrade everything. Some compatibility issues, too.
Displays: I purchased all of the counters and displays. It was all good and I didn't change a whole lot there. It's definetly a consideration.
Of course the legals were all taken care of by professionals. (lawyers, accountants, insurance guy) No unknowns.
I paid more for it than the sum total of the equipment and inventory, sure, but it's nice to have fifteen to twenty people coming in the door everyday asking for additional work since "last year". That part is nice.
On balance, have your stuff together. Be able to answer, and be prepared to verify all statements made by you in response to a buyer's question.
Don't lie, you can get yourself in a world of hurt by mis-representing things.
Just my advice, hope it helps. Good luck.