Certainly you'll want to learn in an American city, if you're desiring the American-English accent.

You'll be exposed to more words and people, culture, etc in the city as opposed to the country.

I wish you the best of luck!

I'd suggest the city of Pittsburgh!

May God Bless You =)  

am also need some help but i think we could develop ours maybe by chatting  ,so my skype ID is "DonSam17" wish it could help..