Books/series should be relatively clean in content - no erotica or covers with not fully dressed characters.
You run the post and giveaway on your site and send me the permalink/link to add to the read-a-thon schedule. Posts must be up on your scheduled date by 6 am wherever you are and you must allow read-a-thon participants one extra entry. Other entries (following your blog, following on Twitter, etc.) are up to your discretion. My only advice would be that having the required entry be to sign up for your newsletter will turn away bloggers, so I would add that as an extra entry.