Hi there and welcome. For the history of this thread, and there have been 4 o5 iterations, we've been using the first page of this thread as an intro page to new fans. There is info there that has recommended readings by Doomscribe and myself. Just click here
In the early days of the internet, Doomscribe created one of the first, if not the first, fan page for Doctor Doom called the Den of Madness.
By the way, he happens to have the most spectacular collection of Doom statues, action figures and other memorabilia. I don't know if he has made any updates lately.
You can't go wrong with K7PV5 and Doom'n Gloom's recommendations but I will add for more recent reading The Bendis/Maleev series Infamous Iron Man and the Doctor Doom series by Christopher Cantwell / Sal Larocca - even though I'm not crazy about how that series ended.