First check out your state laws. Each state is different and each local market will determine the price you can get. In my state it is not legal to sell eggs from home without jumping through a lot of hoops that were really designed for big commercial places, while at the same time we have conflicting right to farm laws that negate the others.
In my market if you say your birds free range and eat grass and bugs people want to pay less because they think you are really getting them for free. Grrr...
Start by keeping track of your feed costs and egg production for a month to figure your cost, then add a bit for things like electricity and packaging. Find out if you have permit or licences you will have to pay for. If you are not in 100% compliance with the laws then be selective about your customers.
Good luck!