Hi,
This seems like a full end to end project. You will need to design, develop and test the system. Where to start will depend on how much background you have in coding and starting your own applications.
If you are planning to create a website to manage a points system for Twitch. You will need some idea of the following before you start:
- Host/Domain for your website. Where are you going to host the website?
- Which programming languages you will use? HTML, Javascript, PHP, Node.JS?
- A design pattern you will use?
- How will your back end talk to the front end?
- Where will you store the points?