minisites are generally not "regular site" but mostly what people call "adsense sites" or "sales products" pages. This is the definition for minisites in our business.
*adsense sites: keywords research, ads, plr articles... as contents.
*sales products pages: 1 page long with description of products (ebook, subscription, dvd, book,....) + other pages like terms, contact.
We do 5+ pages site for our customers and would never associates with mini-sites. Check with your local Web Design pro. organisation for more infos.