You're probably gonna get a lot of really good recommendations and answers from people who know way more than me, so rather than give you a specific reading list I recommend you find something that speaks to you and you know you'll finish. For me, the first thing I ever read was Revolutionary Suicide by Huey P. Newton, for a friend of mine it was Che's Motorcycle Diaries. Neither of these really lay out basic theory and we would have understood more of it if we had done more of the "basic" reading, but they were the catalyst for us to start our own education.

I lied there is one specific recommendation: Principles of Communism by Engels is a much clearer and informative text from the manifesto. It's basically an FAQ, while the manifesto is a call to action that assumes you are at least familiar with the principles. The yellow Parenti video is also a certified banger, though it's been a while since I watched it so I can't recall how accessible it would be to someone just jumping in.

Edit: Holy shit did all 4 of the people replying a few minutes ago all hit post at the same time???