Daniele:

 A   web search    for   "Learn Business English"   should  provide you with several sites which assist with this. I've used  a couple that I have found.

<a href="http://www.yourbusinessenglish.com/">http://www.yourbusinessenglish.com/</a>      ; (British English I think)

<a href="http://www.englishtraineronline.com/2012/11/learn-business-english.html">http://www.englishtraineronline.com/2012/11/learn-business-english.html</a>  ; (British English)

<a href="http://www.learn-english-today.com/business-english/A-business-english-contents.html">http://www.learn-english-today.com/business-english/A-business-english-contents.html</a>;

<a href="http://mbaenglishonline.com/how-to-learn-business-english-vocabulary/#.UpR47abn-cw">http://mbaenglishonline.com/how-to-learn-business-english-vocabulary/#.UpR47abn-cw</a>;

   I noticed that the last  website I listed,  shows Magazines  like FORBES for study.

   Not a bad idea in my opinion.     Good Luck Daniele.  Feel Free to ask more questions.

I am not business expert, but might be able to help with general understanding of terminology.

.

http://www.bbc.co.uk/worldservice/learningenglish/general/

Take a look....might be of interest!

Thank you very much Bruce!!!!