What is you soil type, climate, and water availability for irrigation or aquaculture? These factors will help in identifying possible production. Pigs and poultry are top possibilities, specialising in quail (if there is a market in your area) is a good niche market. Raising fish, for table or growing koi for re-sale as higher value fish, wile using the water for vegetable, flower or herb production can be done very intensively; http://www.backyardaquaponics.com/index.htm
this site gives an idea as to how this can be done.