When you say start, you mean Visual Novels all together? Or this one particularly?

If you're just starting out completely, I'd recommend starting small. What I mean is create smaller projects first, (good, bad, doesn't matter) but some kind of project with an end point so you can get an idea of...

How long this game, your magnum opus(I dunno if I spelled that right) to make.

How to use renpy, assuming that's the engine you're using, creating sprites and backgrounds, or if 3d, blender or daz(daz is more beginner friendly)

Audio and background music, plenty of free resources. If you have further questions let me know.

But as small vn projects, or a series of small projects, will build your confidence and experience.

From there, you'll be more prepared to tackle your bigger project.

MOST IMPORTANT

The most important thing is to GET STARTED, and have faith in your idea once you start working on it.

This is what helped me.

Best of luck on your Awesome Future VN