There are many theories about the fist people, but most scientist agree with theory that all people have originated from Africa. They think that Homo sapiens appeared in South- East of Africa and started to populate other areas. This theory have nuclear-biology evidence.
Most scientists suppose that 18 million years ago the first speeches of Homo sapiens, Driopithecus, appeared in Africa. He walked on four legs. He could use some different objects and tools. And 4 million years ago Australopithecus appeared. Australopithecus moved in small groups, collected plants and hunted animals. Australopithecus Driopithecus
thousands years ago the population began to go to other continents. At first Homo sapiens populated almost all parts of Africa. Some of them went from Africa to Eurasia and started to populate it. 70 thousands years ago, when the glacial epoch began, the level of seas let down. So, group of people from Eurasia went over Red Sea and started to live in Arabia.
When Homo sapiens populated coasts of Africa, they began to move to India, Indonesia, Australia thousands years ago some of people from Europe went to Asia. They are the ancients of modern asiats. In glacial epoch there was the way across from Asia to America which is called the Bering Land Bridge. So, the group of people could go to America.
But it is one of many theories about peopling. Scientists cant say exactly about the first people. They can only suppose. They need more finds and discoveries.