Registration of dvat for civil construction works

Dear Sir,

I took licence of civil works in MCD.

Now I required VAT No. for that I wish to registered online. Now please suggest me where and how to fill the registration form and while filling form the options came, which options I go with, i.e.  type of dealer  options are 1. Regular 2.TAN  3. Casual  e.t.c.

What are the supporting/documents I need. 

Thanks

Mukesh Sharma