Would like to develop an app

My name is Mick and I am looking to have an app developed that works on both iOS and Android platforms. The main purpose of the app is to be interactive, meaning it will be able to perform activities related to information, transactions, and notifications. I have a clear vision for an app that can provide various functions such as: creating profiles, entering data, notifying users based on criteria, managing payments, setting up alerts, etc. It's important that these functions are implemented in an efficient way that is both user friendly and secure. Overall, I'm hoping to create an app that will be useful for its users and attract a large audience.