Starting the for the fact, that you need to start working out. I mean, finding time in your busy schedule. You have to begin eating (balanced), and then do some basic training, starting with only one muscle, then you can exercise compoundly (more than one muscles).

Now, have in mind that you should start training because if I, for instance, recommend you a nutrional program due to the weight and height that you provided, you will gain weight (fat) but not quality mass (muscles)