How to prepare a balance sheet in proper form and content?

It's going to depend on what level you are at, how many different accounts you have, whether it's to be a classified one or not, etc.

A simpler one is here:
http://www.principlesofaccounting.com/chapter%204.htm#PREPARING%20FINANCIAL%20STATEMENTS
Scroll down just a wee bit until you get to the balance sheet.

A more complicated classified one is here:
Principles of Accounting Chapter 4