I also just started creating my own app (link). My knowledge about software coding is last used about 20 years ago. And no knowledge of jacascript yet.
What I did (also advised by @robertklep above)
This is a good starting point: https://developer.athom.com/
Choose “create your own app” and follow the described process.
This will result in having your first app running on homey. Without any functionality yet.
What I did to learn a bit more about javascript is: download the source code of an existing app from github. Pick an app that is already doing a bit what you want your new app to be doing.
And the nice thing about the forum is: theres always people willing to help
