my site is hosted with a company where Joomla is already installed.
That's nice, but check if you have current stable version, for example J 2.5.16 or J 3.2.
...but probably you can also install your own Joomla package, copying files/folders using FTP.
or you can use different, for example, localhost solutions ... I suppose that you have at least one book or e-book about Joomla, in first chapters there are always useful informations.
p.s.
But sure, ask ... of course not questions can been found in books or video tutorials /use youtube to learn basics of Joomla/.