Thanks for that question and that helps let us know where you are in your reading.
We have some initial introductory material on pages like this -- https://www.epicureanfriends.com/wcf/new-user-page/
- but we really need better summaries of the core material.
All of the books and material we have listed in your "Welcome" message are good, and where you start depends mainly on your particular interests. The videos and other intro material on Youtube and elsewhere generally focus on the "ethics" questions and they can leave people bewildered if they don't understand some of the basic worldview issues first.
It would be of great help to us if you would give us feedback on what you find to be clear and what you find to be confusing as you read further into Epicurus. We use information like that to make the website better and to decide what kind of new materials to produce.