I would add to that that your first year or so, it is not bad to plant something easy that will overproduce. In the long run you aren't going to want much zucchini, but your first year it is motivating to have something come up that is edible, once the birds have eaten your berries, the insects have devastated your lettuce, and your tomatoes have mysteriously decided not to give you anything. I would have given up early on if I didn't have something that produced a reasonable amount the first year. And you can often give away excess fresh vegetables, gaining some small amount of social capital.