As for news, I want write my own news. Special page where visitors can read/browse my news, subscribe to my RSS, but at the home page there will be listed latest 3 or 5 news.
I'm not aware of any such extension - though it shouldn't be too hard to code, I guess. You might try creating a separate namespace for your news, and then use the News extension (http://www.mediawiki.org/wiki/Extension:News) on the front page to display only changes from that namespace.
Thanks for your help, HTH.
You're welcome.
PS: HTH = "Hope That Helps" :)
-- F.