various ways to sell produce

   I am getting ready to build some greenhouses and I am trying to figure out a way to sell vegetables to pay a few bills. I will sell quail and chickens, maybe rabbits also. That's the current plan anyway. Help out my locals and make a few bucks. I have considered farmers' markets locally. I wonder if anyone has a database where people list what they will have for sale and the quantities?  One commercial crop to sell every year? I would appreciate any thoughts.

Where you are located would help any replies. Where I am there is no such thing but some food delivery companies (the type doing posh "recipe" boxes) put up what they need each week and you can bid on it. If your road has enough traffic you can do a farm stand, try local markets or contact restaurants directly, if you ask them now there might be something they would like grown for them next year, especially if they are more upmarket restaurants that want stranger and more interesting things.
I started by making boxes, each week I would post on a Facebook group what I had in the box that week and what it cost, and people would buy them, I sold out within hours each time, but there was no pressure on me to have something and no pressure on anyone to buy something they didn't want.

Much depends upon your location.  Pre-Covid, the best model I have seen (money making wise) was in east central Iowa.  Green houses were used to sell quality produce to up scale restaurants.  The people doing this had a van that made a regular circuit delivering fresh herbs and vegetables ....especially tomatoes.  While this was not a huge operation (in my view), it did involve a couple of good sized greenhouses.  They were taking in impressive revenue.

Here we have a very busy family with off Several off grid greenhouses.  Their produce is way ahead of my garden. Each week I get an email of available crops and cost.  I put in my order By email and pick it up at a meeting spot once a week.

The cost is comparable to the grocery store but the quality is outstanding. Everyone on her email list was referred; it’s all word of mouth and she sells a van load weekly.