Hi Srinivas,
You might want to contact a tax consultant in this case. But as per the little knowledge i have, following are the important points
1. The registration forms will be available with the commercial tax office
2. You would have to fill up this form and also submit the following documents at the same office
A. Memorandum of articles
B. Board resolution for authorizedsignatory
C. If it is a new establishment, then the lease agreement for the premises being occupied
D. No of directors
E. No of employees
F. Registration fees of Rs 2,500.00 per director
You will be issued a registration certificate
From that month onwards you can submit the challan based on the slabs for deduction of PT.
Normally they are done before 20th of every month, though there is not pay by date as per the act.
Thanks and Regards
Siva