the glass is the easy part. Residential ususally requires cleaning of the screens, sill (the slanted area at the base beyond the glass). The frames are on either side of the sill and the guide the windows. The bottom of the frames are usually filthy I, too am new, and I price windows on how long I estimate they will take me to clean @ $50 per hour. I have learned a great deal by watching YouTube vids by @lukethewindowcleaner and @Bubble_Guy. Both give generously of their knowledge and experience
Good luck! Also, consider becoming a HomeAdvisor Pro and consider entering the pressure washing business. The two disciplines make one hell of a business.