How to download free apps on iPhone 4s for the first time?

Just got an iPhone 4s today & I'm getting frustrated already. The salesperson didn't know anything about iPhones either. I've already created an Apple account, but when I go to download free apps from the App Store, it's telling me to do something in iTunes first. When I go to do that, it asks for billing information, which I don't have a credit card. I have to do all this to download free apps?

Plug it into your computer and sync it to Itunes first.

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