If this helps, write something that you love writing about. For example, don’t write about a love story that you wouldn’t be interested in yourself.
But if you have an idea, and you really like it, I say go for it!
This makes it so you actually enjoy writing the chapters, and the more you enjoy it, the more ideas might come along the way.
Don’t feel like you have to plan it all out in the beginning, take it slow, take a chill pill, let it develop by itself.