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All your mail should be located in the "~/Library/Mail" folder (where ~/ is the path to your home folder). I would also grab the file "~/Library/Preferences/com.apple.mail.plist" as that contains all your various preferences.
 
Yes. that's all you need.

FYI, if you had that backed up, you could create a user on any mac, anywhere, and put those files where they belong, launch mail, and have all your stuff.

I dont' know why you'd NEED to do that with the way gMail and other email services support IMAP, but the option exists.
 
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