What kind of people lived here 4000 years ago?

Umm...that depends on where you live. Were I live now there probably were what we call "Paleo-Indians" at that time. Different lands have been inhabited by different cultures throughout time and sometimes cultures move from one place to another.

4000 years ago the human race was physically pretty much the same as now. Different clothing, technology, and ideas ruled their everyday life, but they were essentially the same as we are now.