If you're new vegetable growing and wish to see quick results, I strongly recommend planting sweet potato vines. They do well in both shady or sunny locations. The leaves are so pretty and lush, yet they taste wonderful stir-fried.
The best part is, they almost cost nothing. If you buy this vegetable from the market, choose the ones that come with stem. Use the leaves for cooking and poke the stems into soil.
I just planted some today. They may look limp but they'll come alive after a day or two. Just make sure you keep the soil moist. I can assure you that you'll have plenty of sweet potato leaves in no time.