An ideal location, either in a pot or the ground, will consist of 6+ hours of sun light (preferably in the morning), good drainage and away from animals. Why away from animals? Their waste will sometimes kill plants. Along with, who wants to eat a vegetable after that?
If you picked pots as your location for planting, look into getting wide mouth containers. You want a good amount of space for the plants, not only to allow root growth but to prevent disease within the foliage.
Pick a soil that fits your budget. Miracle Grow Garden Soil will do just fine.
Looking towards future articles: Certain plants like tomatoes will be susceptible to crowding and moist conditions.
If you picked the ground or flower beds as your place, then you don't have much to worry about. Sectioning the area off in a decorative way from pets would be a good thing to think about a head of time. Soil conditions is another thing to consider before planting. Chicken manure can bring the most lifeless soil (and plants) back to a bright productive state. Irrigation is always easier to do before the plants have settled down than after they have been.
Once everything is set, the soil has been worked and the pots have been filled, we can start looking now at what to plant.
Look for the next article in the Urban Gardening Series as we start to unravel the different species of plants that would be right for your garden.