Anupkanwar, first I'd recommend to take a look at information about Facebook pages. (http://www.facebook.com/advertising/FacebookPagesProductGuide.pdf) If you are promoting a site/business you own, I would go with a page.
If that is not the case, create a group. Officially - and I would not like to have any problems - pages are only allowed to be created by...
I'm the official representative of this person, business, band or product and have permission to create this Page.
I hope you enjoy the process of creating and promoting a page, looking forward to hearing back from you!