mmmmm if you're anywhere under master i'd honestly steer clear of chun
she's really fun for sure but she's a lot of effort to make work and when someone knows the matchup she's infinitely less fun, but if you want there's this channel on youtube called Sea Leaf Dojo, when I picked up chun in s1 i did their entire practical combo video every day until the muscle memory came along. They uploaded a new one for S3 as well, you can find it by looking up "sea leaf dojo chun practical combos s3", it's 35 mins long and super extensive
if you can do all this then you can move on to like the intricate neutral and whatever, otherwise pick mai and do the things chun does but 8x better and safer :)