How to start a flower pot garden?

I am looking to plant a garden using only flower pots this spring/summer. I am a college student who will be home for the summer and I don't have a yard suitable for planting in. I have heard that you can grow many different types of fruits and vegetables in large flowers pots. What fruits and veggies will grow well in limited space? PS- I live in Iowa. Also, how do I go about preparing the soil and planting the seeds for these plants? When can I plant them? Thanks!
 
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