Service tax invoice numbering query?

Hi I have just started my own new business related to Internet/Web services so i have already applied for service tax number and i have also received the number for same but one thing i want to know is about Invoice Number, i know that i have to start it with 01 and increment of 1 number of each bill but i have to provide the Computerized Generated Invoice receipt all i just want to know that can i follow the below format or not as i have also seen many Invoice Receipt with same format like this:

1) Invoice No: - CS.12-13/S-01 (Like CS for Computer Solutions Company, 12-13 may be year and S belongs to serial number)

2) Invoice No: - DEL/SEP12/01 (Like DEL- Delhi, SEP-September month, 12- Year 2012, 01 will be serial number)

Or any other you suggest

Or i just have to follow the same as like Invoice Manual Books like: - Invoice No. - 01

As i am new to this because it’s my new business so i want to be clear about the Invoice Number format and also that i have to mention the Service Tax: 12.36% in separate parts like Service Tax, Education Cess & Secondary & Higher Edu. Cess.

And one more thing to submit the Service Tax to government is end of every month or quaterly Please help me i appreciate if you help and sort my query as soon as possible

Thanks & Regards

Vishal Sharma