Take a look at this website for general information on certain things related to accounting, such as Financial Statements (Balance Sheet, Income Statement, etc.)
Accounting Balance Sheet.
Basically, list all of your assets (cash, accounts receivable, supplies, land, building, equipment, etc.)
Then list all of your liabilities (accounts payable, bank loan, unearned revenue).
Then the difference will be the equity that you have in the company.
Actually,
Reading The Balance Sheet would probably be a better website to look at for a more in depth look at the balance sheet. The first link is more of a general website for all accounting needs and how to do a trial balance and basic journal entries.