Unlocking an iPhone for myself?

A few things you should know
-The iPhone is AT&T
-I have Sprint personally
-It is an iPhone 4s with iOS 7 installed.

Here is a problem I have came across
-The email for the original Apple account was not verified, therefore I can't disable "find my iPhone" under iCloud settings.

My question(s)
-What should I do to unlock this iPhone for my own use on my Sprint network?
-Do I need to get an iPhone Sprint SIM card to proceed?
-What is the easiest method for what I'm trying to accomplish?

Please remember that I don't even know where to start, so it is okay to talk to me as if I don't know anything (In fact, I prefer it, I want to be taught)

Apart from the icloud issue, you can't use an att iphone on sprint's network. Att uses gsm (sim) technology and sprint uses cdma radio. Technically the iphone has both gsm and cdma radio, but only the radio that is requries will work. (Gsm on att, tmobile/ cdma verizon, sprint). As for unlocking the iphone, only the owner that has paid off the phone can ask att to unlock it. You could go with an online unlocking, but i don't know how reliable it is.

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