link in logo – link for page "homepage"

Hi,

I personnalized, saying that homepage is a static page named “home”. When i click on “home” in the menu, the link which appears is “http://www.mysite.com/home”. (I would like the link to be “http://www.mysite.com/)

When i click on the logo, the link http://www.mysite.com/ appears, and the page is a 404 error page.

I already installed other wordpress website but never had this problem : can you help me please ?
Thank you