I don’t know anything about app building, but I have a great (imho) opinion for an app, what should I do?

Basically, I want to develop a working prototype of an app so that I can use it to show for presentations. This includes sliding, swiping and some clicking functions.

Would I be better off learning how to develop it myself? Or should I try to save some money and have someone develop it? I feel like most successful apps are led by people who know dev and that’s where I’m lacking.

If I should do it myself, are there are free or cheap courses where I can learn how to develop?