How to enter Opening balances????.........

Hi Everyone ,

Can anybody tell me how to enter Business Partner Opening Balances & Inventory Opening Balances?? in a company that uses SAP B1 First time....

How many GL accounts Should be Defined For Opening balance Entry????...

In what way <Negative/Positive> we should enter Vendor's Opening Balances & Customer's Opening Balances....

Can We enter Business Partner Opening Balance & Inventory Opening Balance In same GL Account??...

What is its effects??

Pz Give me details....

Waiting for Reply.....