Its completely fine if u do not know anything about app development and also did not know anything about programming u can start it today.
if u want to build an editing app u must first decide wether this app is going to be available for which platform android or ios(just think about it and decide).
if u thought of android only then u have options like java or kotlin programming language.I suggest kotlin it is best for android app development.
if u thought of ios app development then u should go with learning swift programming language.
And if u have decide to make your app so that it can support both the platform android and ios then u still have many options from which u can decide but here all depends on you wether u want native experience or web like view then go for these :-
(Note)- In Native Experience u need some native coding knowledge but still it is far more better than learning two different native applications
Native Experience
Nativescript + Angular (free)
Xamarin (price depends on what you are doing)
React Native (free)
Webview