Without pictures it's hard, and even with them we could only realistically give you some idea of the prices we'd charge in OUR area.
If you can work out roughly how long you'd expect it to take you; and believe me those little windows, using a 6" squeegie, can take longer than you'd imagine, you'll know how much to charge because you obviously know how much you want / need to earn per hour.
If you're WFP doing the outsides will be nice and quick; just rince a lot, but obviously the insides will need to be done by hand, which is the time consuming bit.
Good luck mate.