Here is an excellent resource on planning a market, or even smaller home vegetable garden. It's very simple to use. You can input your climate zone based on where you live and the program will select plants that you are able to grow. This is the easiest garden planner by far that I have used and the program will calculate information for you like number of plants, planting, and harvesting dates, and also includes information about companion planting. Highly recommend this if you are starting a garden, or continuing one this year. There is a 30 free trial, but if you work quickly you can record all the information that you create and have it for the rest of the year.
This is the resource:
http://www.growveg.com/Default.aspx
And this is a sample of the work you can do on the website, this is my own garden plan to be implemented this summer in Downsview Park:
I have dedicated the top section in the image to growing the three sisters, corn, beans, and squash. A traditional companion planting method used by Native Americans and the Huron Indians here in Canada. The corn provides a trellis for the bean plants, bean plants fox nitrogen which benefits all three plants, and the squash's large leaves shade the ground reducing evaporation which keeps moisture in the ground. The rest of the garden is conventional crops that I personally enjoy eating.
And a little self promotion:
I want to point everyone reading this again to the program that is allowing me to be able to farm in the city this way. We need to reach the goal of 20,000 pledges in order to receive any money. This money will go towards seed, tools, irrigation, compost, and the list goes on, for the collective member farmers. All of the member farmers are young entrepreneurs in the city that believe in the local food movement, like myself. If anyone is from Toronto you should seriously invest in this to help lower some of our carbon footprint here in the city by reducing the miles our food travels.
This link will take you to the campaign for donations:
Makers and Eaters Unity: 100 farmers, 1 city