The Split From Other Primates – The Start
We split from other primates somewhere between 7 to 14 million years ago. This is a critical thing to remember, as we did not completely separate right away. Thus, ancient humans were part of a few early groups. The first was the original Hominini, this was the closest related ancestor we as humans have to the ape, chimpanzee, etc. The second is the Ardipithecus, which slowly became a period where the first bipedal humans came to be. This is essentially the time when we first began to walk on two legs.
The third is the Australopithecus, which was the first to begin using stone tools and other means to create things. The fourth in the line is the Homo habilis, thought to be an evolved set of the Australopithecus. You could likely call them the earliest known version of the caveman. The fifth ancestor to the human is the Homo Erectus, the first version of humans to use fire and cook.