Welcome!
I think if you want to learn about jazz in the twenties there is a wealth of information out there on the internet.
Some key figures to seek out and study to would be King Oliver, Louis Armstrong, Duke Ellington, Bix Beiderbecke, Frank Trumbauer, Eddie Lang, Paul Whiteman, Red Nichols, Adrian Rolini, Fletcher Henderson, James P. Johnson, Jelly Roll Morton. There are many other important figures as well. Enjoy the search!