To determine what sort of visa you need, you have to consider why you want to go to the USA, where you're coming from and how long you want to stay there. For a permanent move, the green card (immigrant visa) is the ideal way to go - but the waiting time depends on where you're coming from and what you have to offer in terms of job skills and potential for employment. It can also help to have family members in the US who are willing to sponsor you - but they have to be close family. Aunts, uncles or cousins don't count.

The best place to start is with the website for the US consulate in your home country.
Cheers,
Bev