What I need to review in Microsoft Window 2007

I have never before had any experience in Microsoft Windows 2007. I read Chapters 1 through 3, but I have trouble understanding somethings and I would like to review them. For example, I do not know how to save documents. I also never used the mailing tab, and I don't know how to use it. I also, need to refresh how to insert graphics into my document. However, I am really good in Microsoft 2003, so I have to get used to this new Microsoft and learn the new things. So I need more work on it, and even if I read the book I need practice.