Satan, Samael, Lillith, Eve, Adam and Senoi, Sansenoi, and Sammangelof? (Questions)

Hello everyone, so I am not jewish (or religious), but I have for the last hour gone down a rabbit hole trying to learn more about all of this, as well as judaism and its beliefs. I find it really interesting and want to learn more, but I have come to you today because I am a little confused with the presence of all of the characters I have mentioned in the title and would love to take in the knowledge of other people on these characters (as well as any other that you might find interesting). Please correct me if I say anything incorrect.

So, from what I have seen, Judaism doesn’t believe in the existence of a definite omnimalevolent figure (such as Satan in christianity) and some people traditionally also don’t believe in fallen angels. My research originally started when I wanted to learn more about Lillith. Which then brought me to Senoi, Sansenoi, and Sammangelof which I found extremely interesting. In the introduction of the website I was reading, it said this “First among these Talmudic demons is Samael, often referred to euphemistically as Sitra Achra – “The Other Side”. He is considered to be the wicked Esau’s demonic master, and in Talmudic literature most of his evil deeds involve attempts to undermine the righteous.

Since the end of the Talmudic period, Samael has often been portrayed as the source of all evil; his agents charged with defeating the cause of good and righteousness. His main partner is his wife, Lilith.”
This is where the confusion began. Originally Lillith was the first wife of Adam (?) until she fled from him after refusing to lay beneath him during intercourse because she wanted to be equal to him. She then arrived in a cave and bore children. Then the 3 aforementioned angels arrived after being sent by God and requested her return to the Garden of Eden, but she refused and so they said that they would “kill 100 of her children every day for her disobedience” (100?! kinda extreme? and where did those 100 come from? I’m guessing it’s not meant in the literal sense?) and so, in revenge, she’d take the life of children (why? what did they do?).

Now I have other questions, apparently Lillith is Samael’s partner…but I thought she was orginally with Adam? Did she go with Samael later? Also, who is Samael exactly? Apparently in Talmudic-Midrashic literature he is also associated with Satan (?), while also being a leader of fallen angels? Wouldn’t that contradict with the beliefs of traditionalists?
I thought the first woman was supposed to be Eve? So is Eve actually Lillith (the opposite?) or did Eve not exist?

I can understand that beliefs and interpretations may have changed over time, perhaps comparably to the christian Old Testament and New Testament, so I would very much appreciate to know what the current general concensus is on all of this.

Thank you very much for reading and I would be greatful to learn from you all.