Hi there,
Since this is indeed mostly a travel forum, you might find this link a bit more helpful:
www.talkaboutusa.comThere you can find infos on visa, places to live etc. Most members live or have lived in the US at some point.
To stay in the US for a year, you will need something more than a tourist (visitor's) visa, so that is something to consider right from the start. You can find a wealth of information pertaining to this on the above mentioned website.
Since you already have a basic knowledge of the language, you will probably not need an English class, living here and interacting with people on a daily basis will bring you up to speed in no time.
I don't know if you are male or female, but in case you are female, your best bet would be to contact an au-pair organisation. Again, you will find lots of infos on talkaboutusa.com
Good luck,
B.