Despite my being born and growing up in the United States I have always liked and wanted to learn some form of English accent, maybe Received Pronunciation or Estuary English mainly because in my opinion, it just sounds better and I really want to try something new. My question would be, where should I start? What are some good resources (book, audio, internet) websites, and in general what are some good dos and don'ts? (and "don't try learning" doesn't count - I am actually planning on dedicating myself (as much as humanly possible without overkill and interference with my social life, or school work) to doing this.
Thanks in advance.