My house needs a brand new roof

We need a new roof! I have an older Viceroy type house with a roof that completely needs replacing. The sheathing underneath needs replacing as well and the ventilation to the roof improved.

I would also really like three dormers put onto the roof to improve the lighting. The windows in the dormers would not have be able to open because they would look into the main area of the house and would be too high to get to. I have attached pictures to give you an idea. The dormers would not have to go on symetrically since there is currently a skylight that could be replaced by a dormer that would make perfect symetry impossible.

I would be looking for start date sometime in the next 3 weeks.

Thanks!