How create multisite

Dear Admin, I am an old customer. I buy and I will buy from here, so I whould create a multisite perfectly alike your, this hotjoomlatemplate as appares in searches.

The fact is that I need to publish some different products for a Customer that will buy a website from me. How can I make multisite with joomla and is there a way to do it WITH your templates? In other words (sorry for my English) is there something that I can buy from this site to do it? Thanks to all and for your reply. :blush:

That is Google AdWords. You can sign up for that Google's program (on google site).