I have an unadjusted trial balance sheet. Just from this sheet I need to figure out what this small business is worth if I were to buy it. What assets, liabilities, capital and revenue do I choose to get the right answer.

Try and get a set of accounts from the available information.
This will give you some idea of a
Profit or loss.
It will also give you what the Net Assets of the business is.
The difference between the price you pay and the net assets will be the
Goodwill of the business.
The balance day adjustments are usually not very material.