But if you say you would be very grateful for help, I would be worth it, because I love it when people are grateful. I know of one useful site that has clever information about app development. Go to the article how to develop a fintech app https://surf.dev/what-you-shall-know-to-choose-go-vs-rust-for-your-next-project/ to learn how to develop successful financial apps. But if you realise you don't have the strength, you can safely hire a team of programmers, which you will find on the same site.