I haven't read the content or looked properly at the site but I can see your entire content without even signing up. Since you are eventually going to charge you definitely need require a login for the content.
Actually, we are not planning to charge for the guide. The goal of the guide is to help startups. Startups don't have extra money to spend, so we're not hoping to make money off them anyways. We'll have other premium features in the future to make some dough :)