Thanks for your help, but I still can not, I'll explain what I did following the guidance that I have indicated:
(Forgive me if I say something stupid, but then again I'm new to this thing)
I created a site called www.prova1.it
I went in ISPConfig DNS section
Then add New DNS Zone (SOA) and I added Zone (SOA) prova1.it, then I entered NS ns1.prova1.it, then went into the TAB "Records" and I added the "A" as the hostname "www. prova1.it "then I entered my ip address of the server I checked on active and I have saved.
Finally I added this line in / etc / hosts
Then I combed apache, but nothing.