It is important that you know what kind of lizard is it. Mostly lizards are insectivores but they can also be herbivores or carnivores. You can start with household fruits, vegetables and flowers such as green Iguanas, cabbage, lettuce, garden weeds. You can also feed it with reptile supplement. For details see the link below: http://www.animalhospitals-usa.com/reptiles/lizard_feeding.html