Invoicing if limit exceed notification 08/2008

Service provider exceed turnover limit Rs.10 lacs in the year of starting of business.

Upto January'11 turnover = say, Rs.5 lacs (not anticipated that it will exceed Rs. 9 lacs during the year, so not get registration)

In January' singal billing to single party = say,  Rs. 6 lacs.

ie. now cannot avail examption 08/2008 as turnover exceed Rs. 10 lacs.

How should , if servicer already provided without reg. in jan, he will raise invoice to that party, provided that he get registered  upto march 11 ie. after provided services -

1) Invoice with service tax or without service Tax?
- as unregistered u cant issue invoice by adding service tax.

2) is it possible to raise two invoice Rs.  5 lacs ,without ST + Rs. 1 lacs with ST??

- break up of invoice will not resolve the prob. 

3) If Orchestra services provided at Employees colony of party (Manufacturing Concern), for New Year Fest, if eligible for Cenvat Credit for the Same???

- orchestra party is not input service, input credit not available.