I have some ideas about some apps that I want to create .How do you know if they will be successful ones? How can I have some ideas about pitching, searching for investors? What would be some great resources to have a bigger picture about these stuff?
Turn it into a business proposal first, then ask relevant people whether they think the chance is good that the app will be successful.
However, even after their opinion, you need to ensure that the app is well built and have enough exposure to your target market through advertising.