go to your "C:\xampp\htdocs\silverstripe\tutorial\code" folder and duplicate the page.php, if you copy pasted it (ctrl+c, ctrl+v) it will be renamed "Copy of Page.php" rename is to homepage.php then open the file in your editor...I use jEdit -=)
"class Page extends SiteTree" becomes -> "class HomePage extends SiteTree"
"class Page_Controller extends ContentController" becomes -> "class HomePage_Controller extends ContentController"
ok now go to your templates folder and make your HomePage.ss(just dup the Page.ss to HomePage.ss for how, then edit it after the flushes)
Flush your DB. "(mysite)/db/build?flush=1"
Flush your CMS "?flush=1"
when you login to the CMS under page type your going to see HomePage.
So if you want to know what you did? I got no idea
You dont have to name is HomePage you can name it any thing just as long as the php class names match.
Also the first time I tried this, during the DB flush I got some errors. I just did it over again and it worked.
Please tell me if this works so I can set up a tutorial -=)