The 12 Caliphs of Islam

What do you think of this topic of the 12 caliphs? I been reading a lot of hadiths lately, and islamic history (the first fitna, aka first Muslim Civil war) all those stories about Fatimah, Ali, Aisha, Abu Bakr etc.... About the seperation of Shia and Sunni.

It confuses me a lot, so I hoped someone here could explain me about the 12 caliphs. It may seem very "shia" of me, but I still wish to know the true path. And I am not Shia or Sunni, I am only muslim who believes in Allah and his Messenger. Eventhough my parents are Sunni.

(I don't have permission to post the link, but I hope u know what I'm talking about)

Could anyone clarify this to me?