Service tax payable for a new company

Hi All,

I have registered a new OPC company(Software Services) under New Companies Act 2013 four months back, as i am having engligible transaction apart from the invested paid up capital of rs 100000.

I am about to get the first payment from my first client for Rs 11 lakh change.

Question One:

1. DO i have to mention Service Tax Registeration Number in the invoices i raise ?(P/s i have zero transaction till date, & i have not regisered with service tax)

Question Two:

2. Will i come under service tax scrutiny for this transaction?

Kindly Advise ,

Thanks In Advance

Regards

Vaibhav