Let me preface what I am about to say by letting you know that I do not have a second (professionally speaking) as an aerial photographer. However, I am in the process of researching in order to possibly pursue a venture in aerial photography. Some of the best advice I have rcvd, has been from Navigator72. If you start looking on line, you will get an idea as to what people use, and what they charge. Go to a website or 2, and see what they charge. Figure out what it might cost you to rent (or own) an aircraft, pilot etc. Soon you will have an idea as to a bottom line $. I guess you would work your way up (or down) from there.