<p>If you know what area of the world you want to work in, learn the language(s) of that area. Even if you don't know, learn and become fluent in a foreign language(s).</p>
<p>In most (if not all) countries, a person has to write an exam during the application process.In the US, it's the Foreign Service Written Exam. This website will give you more information about becoming a diplomat in the US: <a href="http://www.ehow.com/how_12359_become-diplomat.html%5B/url%5D">http://www.ehow.com/how_12359_become-diplomat.html</a></p>