im doing it. no need gym membership. just have to show up and push hard.

No experience but seems legit. Coupled with a sound diet, you'll look awesome.

Check out Bar-isan in malaysia . They have a gym specially for calisthenics .it is possible to grow with that and along with what darklinght said, diet.

mine is just basics..
push ups
pull ups...
currently working on muscle ups. 

yeah...im working on human flag also... shoulders, and pure core control.. ur core should be able to lift ur lower body and balance... i hope i can do it one day....

Same with me here (more like trying to perform a muscle up)

I watched a video (strengthcamp collab with barstarzz), they say you could try doing full leg raises to achieve the core strength needed for human flag in which you would hang yourself on the bar and try to bring your feet up until it touches the bar.

Btw, there's a lot of callisthenics group in KL. Hartamas, Setapak, Melawati...

Check our bar brothers florida , they have a few tutorials there too .