VisitScotland is the official site of Scotland’s national tourism organisation at www.visitscotland.com
This site has many pages informing potential visitors all bout Scotland, where to go what to see etc. The site is a also a directory of accommodation providers, tourist attractions, tour guides etc.
Also check out their www.visitscotland.org website as this has tons of information relevant to tourism business operators in Scotland. This is also where you would register your own tourism business/website.