Hello,
I liked the props you showed in the description of your project, I can do something with this quality and I would like to get in this project. About values, I don't charge much, I'm looking for experience, so I will be very fair in values. If the character is simple, I can charge something around 100$ (five days, if you providing concept art of the character) for a similar truck like you showed in the example, I would charge around 90$, but, of course, everything can be negotiable.
My workflow for a character is like this:
> Base mesh for body in Blender 3D/Maya
> Sketch 3D (body, face, hair, gun, clothing etc) in Zbrush
> Your revision requested (if you want)
> Details of all in Zbrush
> Your revision requested (if you want)
> Low Poly mesh in Zbrush
> Bake maps in xNormal
> Texture all in Substance Painter or dDO
> Your revision requested (if you want)
> Finish texture in photoshop