Hi,
how to modify a master page layout is described here, but it is not probably what you need:
Page layoutsThe same way as master page layout you can modify the layout of you Home page. You can add one additional zone to this template using fore example code:
<cc1:CMSWebPartZone runat="server" id="zT" />The id property has to be unique.
Then you could add a new web parts into this zone on your Home page and it would be visible only on this page.
Best regards,
Ivana Tomanickova