I'm planning to be the director and as far as style, I'm not sure what you mean.............
As a director you need to have a vision about how the movie should look and feel. (Style)
Otherwise the DOP has no direction. (That can be cool...)
Style is something obvious and vague because it entails almost everything:
- era an setting of the story (props, clothes, setdesign)
- use of color
- use of cameramovement (or not: tripod, dolly, shoulder, cars, drones, etc?)
- use of light (contrasty or not or whatever)
- certain Depth of Field choices (influence the amount of light needed)
- the pace and rhythm of the movie and each scene (a lot of cuts or long takes or a mix)
Every aspect has its effect on the budget, crew and time needed.
Besides that you need to break down the script into the number of locations you need to shoot.
My honest advice:
make a short with more crew first.
It will help you gain experience and overview for your feature.
Plus it's easier to overcome mistakes in a short project than on a feature.
And by then you may have an idea of the style you're going for.