How to transfer apps/contacts, etc.

If this is an obvious answer, please go easy on me.  I am so not tech savvy at all. 
I have an iphone 4s through AT&T.  I may come to regret this (because I'm happy with AT&T and I've heard Sprint's network *****), but because of an unbelievable deal through my brother in law who works for Sprint, I am switching to an iphone 4s through them.  But how do I get all of my stuff off my current iphone?  Apps, contacts, music, etc? 
Thank you!

iPhone: Transferring information from your current iPhone to a new iPhone

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