Do wash your new human hair wig before you wear it. Do not wear it for weeks before washing. These wigs would have had a lot of chemical processing and most of those chemicals can be absorbed through the scalp. Please wash them first.
Do purchase with the knowledge that the wigs will need to be professionally styled before they can be worn. They do not come pre-styled like synthetics do, even though most are pre-permed to attain a specific hair texture. Do not become discouraged by how it looks out of the box. Again, it will need to be styled before it is ready to wear.