After sketching your apps, it is time to try TouchDevelop & Windows App Studio. Both websites are designed for creating apps. Go to the links and explore them. There you will find some videos and tutorials that can help you to use them. If you need more help, please go to YouTube and find videos from which you can learn and share with your
Your task is not to create apps now. Just go to the links and play to decide which one you are going to use when you start your app.
If you have any questions, please let the conversation go below.
All the best!