The average yard, even in a city, can be large enough to grow plenty of produce.  In fact, some of the best advice for beginning gardeners is to start small.  A single zucchini plant will provide enough for a small family - chances are you have more than enough room for a great beginners plot.  A good starting size for a garden would be about 10 ft x 10 ft, or room for 3 or 4 beds.  Working in a yard garden requires more time and effort overall; in planning, execution, and equipment. 

Some basic tools to have on hand as you get started are: a shovel/spade, rake, chicken wire or posts and string for a fence, and possibly some 2x4s or old boards for building raised beds.

Raised beds are often recommended for city dwellers because you essentially create your own, rich soil.  We will explain more about raised beds in the next section.

For now, check out these other helpful links for more general information as you get started:

National Gardening Association: Planting a Vegetable Garden 

Farmer’s Almanac: A Beginner's Vegetable Garden

Martha Stewart Whole Living:Beginner's Guide to Organic Gardening 

Eventually you will also need seeds, compost and mulch, but first, see Designing your Garden.