Current bank account for vat/cst reg., mandatory?

Hello all experts out there,

Yesterday, I went into SBI for some info on their current accounts. I was told I need to have VAT/CST number before I could open an account with them. So here is my question,
1. Can I register for MahaVAT (preferrably online) using my saving account (for the time being)? 

2. I also have another question, if I want to register for coupulsory type of VAT (instead of voluntary), do I need to give them my bank statements? I'm asking this because I heard of bank statements from agents only and there's no mention for requirement of such documentation on MahaVAT official website.

Thanks.

I could use this info urgentely. :)