Hi, I've been selling eggs for about five years now. There are several things to keep in mind. It's an up and down sort of thing. Customers come and go, and the chickens have their ups and downs. So, you can't always count on sales.
I have found the following things in the market where I am (Ann Arbor). First, My customers seem to prefer that I at least rinse the eggs off and refrigerate them, However, I have one customer that wants them un-washed and un-refrigerated the way they do it in Europe. I keep a basket of eggs separate for her. Some love a variety of colors, and some don't. Give them the option. I have a sign at the road that says simply "EGGS". That brings me a few customers, but not a steady supply of them. I periodically put an ad on Craigslist when I get too many eggs and too few customers. I use re-cycled cartons which my customers are only too happy to supply. However, this too can be unreliable. I bought some of the cheapest plain cardboard cartons I could find to have on hand. I print labels with my name, address, and phone number on them to put on any carton that leaves my place. I take eggs to the local farmer's market during the summer. I have other things to sell as well, and these seem to bring in people. I give eggs to charities like churches and local shelters when the surplus gets too much for my storage. Churches and the local shelters have some rules so, call ahead. Last, I ran out of space in my kitchen refrigerator, and customers sometimes need to come at times when I am not home. So, I put an old refrigerator on the back porch so they can help themselves. I have never had any stolen from there, but I did have them stolen from a roadside stand I used to keep. The refrigerator freezes during winter here in Michigan, so I don't use it during the worst part of winter. While freezing doesn't harm the eggs, customers don't like them to be frozen.
I always make enough money to pay for the chicken's feed and other supplies. Sometimes I get a little profit for myself. I keep a teapot on the kitchen shelf where I put the cash. It's handy to have for making change, and I can dip into it for money to go to the movies or out for dinner.
I get a kick out of my customers. Some have become friends. They seem to look forward to a chat when they pick up their eggs if they aren't in too much of a hurry.
To sum up: put up a sign at the road, run an ad on Craigslist, go to a farmer's market, tell all your friends and neighbors. Many people I know take them to work to sell, and my hubby has some regulars at the local pub, too.
Good luck. It's fun, really.
Glee at Fair Feather Farm home of happy hens.