Can you recommend me some calisthenics programs? - szmer

I am a bit of overweight guy and I don’t know anything about lifting and fitness. I can’t go for strength due to very weak joints. (no loaded squats) I would like to go for body building or hypertrophy training. Some pointers, tutorials and links to resources are welcome. As equipment goes I only have resistance bands and a bicycle. Also how important is a diet in keeping myself fit?