Of course, if you're going the paid ad route, you could also use Facebook and Google re-targeting to keep that awareness and interest level high. For example, if you've ever noticed after leaving a particular website, that you begin to see their ad everywhere, there's a particular reason for that. Especially if they've already entered your sales funnel, this is a very powerful way to get them to act.
This is one of my favorite things about LeadPages. For most people, designing a lead magnet landing page on their website is difficult because then you’d have to mess with the coding on your site and could potentially break something. LeadPages makes it mega easy. They have about a zillion different templates you can customize to create landing page opt-in forms, like this one:

Being a few years beyond the Millennial generation, I was in need of a conversation with a Clickfunnels representative to answer my questions. A rep immediately emailed back some link that were in no way helpful. I emailed back to again request a conversation. A rep called Nicholas replied that they are not allowed to talk on the phone. Pathetic. Cutomer service is a zero.
Have been through many rounds of A/B testing. Testing and correction is how we learn and better ourselves. A/B testing your landing page (tweaking individual elements and seeing how they perform against the previous setup) is probably the most powerful tool in creating excellent landing pages. Not sure where to start? Signal vs. Noise provides a nice example of good A/B testing that’s an easy read. There are always things you can do to improve, so don’t ever stop testing!
Landing pages originated with the IT departments of Microsoft in late 2003 in response to poor online sales of Office.[5] The process was tedious and time-consuming. As a result, in 2009, several startups, including Unbounce, were formed to simplify and streamline the process. The rise of cloud computing and e-commerce around 2009 provided ideal conditions for these startups to flourish.[5] Since then the customer requirements changed, requesting integrations with other solutions such as email marketing, lead nurturing and customer relationship management systems.
Steps in Sales Funnel – This lays out for you, point-by-point, each page and step the customer goes through on their way to making a purchase. In some cases, it also works to point out some of the follow-up steps and “if-then” scenarios. For instance, how does the funnel respond “intelligently” to get prospects who didn’t buy to come back to the website?

Clickfunnels: Review, Demo, Pricing and Features: