They need a lot of sunlight and it is best to place them near open windows or doors so that they can easily trap passing insects and flies.In order to get maximum growth and efficiency water them with distilled water or rainwater.Keep the plants in a plastic container and keep it 1/3rd filled with water.Make sure that the growing medium is damp to wet all year,the growing medium should be 1 part peat moss with i part sand.There is a blog about growing Venus fly trap indoors in planet natural you could check it out.