Green screens are a pain in the butt. The problem is lighting. Everything has to be so flat (no shadows) to come out right. Then, when placing the subject on a new background, the new background and subject need to have the same lighting, or it's obvious that it's a green screen capture.
You are on the right path. I started out the same way. This was my homemade background and "test" shot:
This is my first purchased backdrop:
This is the backdrop that I use more than any other one:
I would suggest concentrating on photography skills before photoshop. The "tricks" should come after you have a firm grasp on how to take a perfect picture without needing post editing in photoshop.