After all the basic information, you can get started and find you perfect host family in the US.
Register on AuPair.com and look trough the database of host families in America. There are tons of nice families, just add them to you hotlist or get in touch with them directly. Remember – if you want to write private messages you need to become a premium member!
If you found the right family on AuPair.com, make sure you and the family contact the same local agency in order to apply for a visa!