Some of your Questions:

About getting started

Do I have Codes Access and Ownership?
Any additional cost for domain and Space.?
How many days it takes to go live.?
With our Auto Store Builder and Automated Solution your store gets live in Minutes and our Go live provides training within an time of an week

About customizations

Does Nationkart design website as per my documents ?
Can I get design customized as per my reference ?
Is there possibly of custom or Add on requirements .?
Yes we support customizations or Custom Add on features but all the requirement need to provided in well documented way before starting things and as per same we will provide with the custom quotes on same.

Catalogue Management

How will I manage my products and Catalogue ?
Will Nationkart Upload or Manage products and inventory for us ?
What kind of Support does Nationkart offer ?
We provide support based upon support Ticket solution and in the starting there will be Go Live team and latter Support based upon ticket based system

Third Party Services

How does Payment gateway works ?
How does shipping works ?
Graphics and Media designing ?