E-commerce

I am entering into an E-Commerce business and having few querries regarding it. Please help..

1.)As we will be focussing on international clients, so will there be any kind of duty attached to it or any formalities to be fulfilled. We will be selling all the goods outside India by saying it as samples, so the remittance of same can create any problems.??

2.)In the beginning we will we will take cataloques of other companies and will upload their products on our websites. So please suggest me in this case that we will be charging rent from those companies for giving them space on our website or we will just treat it as normal sale and purchase from those companies whose products are uploaded in our website or we will be treated as an intermediary and will receive the commision  on sale.

3.)We will be selling unstitched suits and sarees on which VAT/CST is not attracted. Supose if we get an order to get the blouse stitched  as per the measurement, so will it attract VAT/CST or it will attract Service Tax on the same or both will not be attarcted.

4.)The product which we will be purchasing will not have a label on it  or if it has we will replace the same with ours. So, will excise attrtact to us in this case.

Thanks..