Microsoft produced some fantastic interactive menu-to-ribbon guides. For anyone still to make the transition from Office 2003 (or earlier) to the more recent versions of Office, they can be invaluable help.
They are small downloads, that once installed will open up in your web browser.
There are ribbon guides for all Office applications (Word, Excel, PowerPoint, Outlook, Publisher, Project, OneNote, InfoPath, Visio and Access).
Alternatively, remember that your favourite keyboard shortcuts still work!