Liability of collection of service tax

This query is : Resolved

pradnya (Querist)
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13 December 2011 Respected Experts,
I AM AN ADVOCATE.

I HAVE TAKEN REG NO IN OCT 2011, I HAVE NOT CROSS THE LIMIT OF 9 LACS TILL DATE BUT WILL CROSS THE SAME TILL DECEMBER END.

MY QUERIES ARE
1. WHETHER I AM LIABLE TO COLLECT AND PAY SERVICE TAX ON THE BILLS RAISED BEFORE THE REGISTRATION AND AMOUNT RECEIVED BEFORE THE REGISTRATION ?
2. WHETHER I AM LIABLE TO COLLECT AND PAY SERVICE TAX ON THE BILLS RAISED BEFORE THE REGISTRATION AND AMOUNT RECEIVED AFTER THE REGISTRATION ?
3.I have not charged or collected any service tax till date of registration.
4. what will be my first return for oct to march 12 or april 11 to sept 11.

pl guide me.

thanks in advance for your valueable guidance.