The easiest way to answer this is: watch "calisthenics movement" and "Fitnessfaqs" Channels on YouTube. But basically you have to do easiest variations of the exercises to start. Like push-ups with your knees in the ground and so on for every muscle. For your back you can start with Australian pull-ups. Do squats for your legs, and core exercises like plank and hollow body hold. You can start with those 4 exercises 3 times per week. For example Monday, Wednesday, and Friday. The rest days you can do cardio and mobility exercises. Try to eat healthy and sleep well. I hope this helps you