1 - You need to know WHO you are going to serve (Your Audience).
2 - You need a way to attract people to your list (Your Gift - this is something that your future customer most needs to get a result in their lives. Often that is something easy to consume, like a checklist, but it can also be more complicated, like a guidebook).
3 - Then you need an offer page on a website. This is where your future customer gives you their email address.
4 - Lastly, You will need tech integrations set up so that after your user signs up for their "gift" they will be directed to a thank-you or upsell page, as well as get an initial email with the "gift" that they signed up for!
And... you're almost done!! As now you need to add those people to a list so you can follow up with them.
All of that sounds complicated. That's because it is! (or was)