USA Genealogy.

 
The basic first steps will be pretty much the same when researching your family history in the United States of America, but in addition there are many useful websites specific to the USA which you will find extremely helpful.

Undoubtedly the premier site in the United States is USGenWeb project, whose motto "keeping Internet Genealogy Free" speaks volumes. Most of what you will need will be found on this site.

The federation of Genealogical Societies website is definitely to be recommended.

The Ellis Island website contains much information about the arrival of immigrants, including a passenger arrivals search facility.

An excellent website - General U.S. History - that journals the history of the USA. It contains information on the colonies, has a timeline, maps etc etc. A must visit site that will help you to understand who your ancestors were and what they were about.