Well, long story short?

  Start from the beggining, get used to the vowels and consonant sounds. ''I'' has an ''ai'' sound; double ''e'' (ee) has an "i" sound; two "oo" is equivalent to our "u".

  The ''u'' in English has a ''iu" sound, so UNIVERSITY you say "iunivérsiri" or sometimes they say "iunivérsiti".

   Sometimes ''t'' has a ''r sound'' when it comes before a vowel, it´s the case with GET before ''it''  (I got it-I górit).

   Buy Speak Up magazine and read and listen to the articles as always you can", along with other resources (there are Dictionaries online in wich the pronounce is given when you look up for a word). 

    There are programs like Talk Any (well I am a little outdated, don´t know if this program exists by now, but it will be my example for the time being).  In these programs you can provide entire sentences in English and they will "talk them (the sentences, I mean)".

    If you have a good English teacher or friend, like Dale, Deivis, Breckenfeld, Pat and Marcio or others living at a stone´s throw away (close to you), it´s advisable to take some lessons on pronounce.

   Not so short as promised, but the subjet is not that easy to be shortened anyway...