Hello! I plan to create 2 web sites about unrelated things. But the main aim is to put advertisement on them to promote another my web site. All of them hosted on the same account. Is it advisable to do ? I am also plan to register all of them on one google account(Analitics, Web Master )
Yes there is no problem about what you plan to do. Try to apply white hat seo technics to promote all the sites.
You're lucky, Google Analytics can handle more than one site For this you have to enter different details and content.