Well, 'will visual novel' could be a new or relatively unknown visual novel. Visual novels generally rely on strong narratives and character development. Maybe 'will' here refers to a character's will or the overarching theme of the will to achieve something in the plot. Without more context, it's hard to say exactly, but it's probably an interesting exploration of a story through text and visuals.
First, you need a good story idea. Then, you can use software like Ren'Py which is popular for creating visual novels. You also need to create or gather art resources for your characters and backgrounds.