When you start programming your first web app you are embarking on a new opportunity and learning valuable skills that you may have never fathomed you would set out to do. You're not alone. Everyone has to start somewhere! It's all a learning process.
When you are learning a new technology, sometimes you feel overwhelmed by all the new information you are taking in. There is a lot to learn and everyone is constantly learning more so don't be afraid to reach out for help. Chances are someone has been in the exact same spot as you before so they know exactly what you are going through. They are more than happy to share their knowledge to help you. The beauty of technology is not just the vast world of opportunity and knowledge there is to delve into but the mass of resources and people who help you grow. Collaboration leads to sucess.