Howdy,
I love rcc56's reply.
You should consider taking an on-line swing mandolin class with Matt Flinner who offers them periodically throughout the year. You might even be able to purchase lessons from previous classes at his website:
https://www.mattflinner.com
I've recently become a fan of the iReal Pro app for practicing improvisation over jazz standards. If you have the app you can download hundreds of them for free to your computer or smart phone. I've posted a couple of charts here:
https://www.irealb.com/forums/showth...Scotter-charts