If you plan on getting serious about doing offers, you might want to check out GptTracker.
It's a website that helps people keep track of the offers they do. It would be particularly helpful if you were working several sites.
I have never used the site, so I can't say how easy or effective the site is.
But I will say that trying to keep track of the offers I've done is a tough job -- and I ultimately gave up doing offers in favor of surveys and PTC because of it.