To price something you need to start with what market you are targeting. Do you have an idea what you are looking for as a clientelle? That determines three key factors:
- Size of the market (and what part of it is accessible...understand your competition)
- What their preferences are (photographic style, Media etc)
- Current price points in the market for that sort of work
Then taking this information build up a cost model of what you need to buy in assets, what you need to spend on consumable (not only photographic materials, but also gasoline for transport, any equipment or location you might rent etc) and what your time is worth. That last one is key, since time IS money as the old addage goes. Finally put an overhead on top for time and materials associated with marketing and sales, Insurance etc. Then build a cost model that considers all these things. Consider current market price points for the service and the prints (assume some print sales, but make sure your service price covers you basic overheads and a portion of your time) and do the sum against your costs. This is your likely profit, then make allowances for tax you would need to pay, and the result is your take home profit after tax. Does that number sound reasonable? Remember, this is the money AFTER you have been paid the value of your time, i.e. it's what is called your Discretionary Cash Flow...what you can spend on whatever you like. If the answer is yes, then this is worth it. If not then look for an alternative pricing model/point or a different market segment.
For example, if there was a market for polaroid simple snapshots in the street and 10 people a day were prepared to pay $40 for each for a portrait of them, and I only need to take one shot for each portrait and hand over the print, this would be a very profitable business...an unlikley market, but I am trying to give you an idea about why the market matters. Understand the market, you understand the business.
By the way people always struggle with what their time is worth...well take what is called an opportunity cost...what job could you be doing in the time spent and what would you earn. Certainly as a minimum it would be minimum wage.
Good luck..
K