I like jazz.
Thats great!  Jazz is a music genre that originated in the african-american communities
When did it originate?
Jazz originated in the late 19th century 
Are there different sub genres of Jazz?
Not much info on that but jazz since the 1920's age jaz has been recognized as a major form of musical expression 
What is the most common instrument used in Jazz music?
Not much information .  But jazz is the swing of blue notes, call and response vocals
Wow, that's so cool.  Who are some popular jazz musicians?
One popular musician is Miles Dewey Daves lll he was an american jazz trumpeter