In dealing with people who "want" eggs. Start selling what you have to the people who actually "buy" them, not just say they want them. There are those who will say so, and NOT actually do it regularly.
Figure out first what your actual client list is. What their demands, preferences and scheduals are. Folks who say they want eggs are unhatched eggs. People who do buy what you do have and do so regularly are your first consideration. Then if they consistently would buy more than you produce, more chickens, or better layers.
If you don't have more room, sort the birds you have for the BEST layers and turn the others to soup to make room for better birds. If you have a mixed flock, older birds and/or limited space consider some of the uber producer breeds instead. What you can do rationally within your current limits makes more sense while you're starting up. Maximize your flock, sort your clients, then if there is enough demand consider up sizing.
Doing the expensive and risky first, is cart before horse stuff.
Stick to the comfortable and practical. You can do it. You've a good start.