thanks everyone so far for really being helpful, i also read that"complete idiots guide to Jazz' is better than "jazz for dummies", its hard to decide Ken Burns or Smithsonian Collection of Classic Jazz for that 'first chronologically compiled selection' to start off with, guess either will do, maybe get that Idiots guide as well, and maybe Gridley's Jazz style later on.
Already found i like Duke Ellington's music and really enjoy be-bop (Charlie Shavers and Buck Clayton), getting there slowly.
Cheers