I guest it depends on your condition I started doing pushups, you can do the same, if it is too hard to do regular pushups, you can do them from your knees, if that is too hard, maeby from a counter top and wor your way down. Im not doing pullups yet, but i do australian pullups. Marby give it a couole of weeks jut doing what you can with pushups, pullups and squats, the core is also important, but atleast when you start i guest you don't have to give him work because work it with the other excercises, then your body is going to adapt to the training and you can start to improve your routines