I think the object of this part is to create a list of people's emails so that you might have a database of people to sell things to. The easiest way to create this email list is to offer them something free. That way people will be willing to sign up for your free whatever it is that you want to give them. Once you create a little form for them to put their name and email into, then you give them the free thing. It could be something they download, or it could be something tangible, such as something physical you send in the mail. It would be more expensive to do that, but the way you get around that is to do a raffle. If you offer something really good, something that costs money, like a gem or a ring or something similar, you could raffle it and still, people would be willing to give you their email just for the act of getting in on the opportunity to win the ring or the gem or whatever it is you would like to raffle. It could be a "Fidget Spinner." It could be anything.
Brian , your every post is like a book, I always read your post and try to find a few questions to ask .. but to be honest your posts are that comprehensive that, I don’t find a question to ask because you left nothing unexplained ! I wonder how long you take to prepare a post like this, I probably would take a whole year ! 🙂 Good luck Brian. you are a magician of IM strategies.
Some ad platforms will ask more of your landing pages than others, when running ads. For example, AdWords is much stricter, when compared to Facebook. AdWords typically requires that you do not have a ‘thin,’ site that is designed solely to collect leads.  Because of this it might be a good idea to focus on using Facebook or Twitter, to begin with.