The attack plan is fine if it is driving TARGETTED traffic. Check your stats to see where people are comiung from and what terms they are typing into search engines.
Personally, I always spend a bit of money on PPC first to see if an offer is converting. If I think it's worth the time investment, I will do natural
SEO later. I also track my PPC keywords VERY carefully.
I remember a few years ago a very experienced marketer who demonstrated his approach with a tattoo design ebook - even he with all his marketing experience couldn't get it to convert particularly well. And he had a PPC budget.