Dear Sirs,

Would you please send me sample of balance sheet ?
Thank.

What day is it going to be realized that we're not all "sirs."

You haven't said what type of business or how involved this balance sheet is to be, but here's a few examples:
Sample Balance Sheet | AccountingCoach.com (http://www.accountingcoach.com/online-accounting-course/05Xpg04.html)
Principles of Accounting Chapter 4 (http://www.principlesofaccounting.com/chapter%204.htm#PREPARING%20FINANCIAL%20STATEMENTS )
Principles of Accounting Chapter 4 (http://www.principlesofaccounting.com/chapter%204.htm#Classified%20balance%20sheets)