No you don't Need to buy that. It is one of the essentials. Take your time to dig into it. Use the active view to directly see what you are doing. That is exactly the way I work. Do not put hundreds of lights in a scene at once. Start with just one. then add more, if they were needed. You can download a white sample material from peter Guthrie or bertrant benoit.. The light in this scene is simple but great. (it is a v ray scene, but it is easy to convert to corona) use one fill light to give global light to your scene. Then add light to enhance details. I would not use hdri in the beginning. Give it a try, sooner or later you will get good and better results.
