Profession tax registration

hie..

I have a client they have not taken profession tax regn no. Also not deducted p tax throughtout the year 12-13 ( its a newly formed pvt ltd co.)

So now if we register now, 

1) should we deduct the tax from employees  salary of march , the amt for the entire year. and pay along with interest.

2) or if we get pt regn no now, and start deducting from april 2013 onwards.

3) reg directors, they do not draw salary, so then too we should register them and pay rs 2500 pa.

Pls guide on an urgent basis.