What was the lifestyle of Native Americans before White Settlers came?

This question is a little too broad to be able to answer in a brief space.  Mostly, the problem is that there were many different kinds of Indian lifestyles, depending on the place and the time.  The coastal Indians in Washington State, for example, had permanent villages, totem poles, etc while the Plains Indians were nomadic and had teepees.

Broadly, though, the only thing you can really say about all pre-contact societies is that they had no European technologies -- no guns, no cloth, no metal, etc.  Other than that, different places had very different ways of life.