I’m just now dipping my toe into Jazz. Autumn Leaves is a highly recommended Jazz tune to begin with because it has a typical ii-V-I chord progression, in both the major and its relative minor key.
I have completed talkingbass chord tones and am 2/3rds through talkingbass sight reading, and similarly 2/3rds through Theory for Bass and am only just now feeling ready to play around with Jazz. That being said, it’s very engaging music to study and learn to play so have fun!
I’ve found a lot of sheet music for common Jazz Standards online, also maybe do a search for beginning Jazz standards, or perhaps this forum can suggest stuff. I’m not an authority by any means, I chose Autumn Leaves because both Mark at talkingbass and Scott at SBL both cover in depth so it’s what I’m starting with.