You will be able to download apps over WiFi, however, many apps now require a later version if iOS than the 3 GS supports, so it will be limited in what apps you can have. You can download apps using the App Store app on the phone. You should first go to Settings/iTunes & App Stores and sign in with your iTunes store ID so you won't have to pay for the apps. You can also connect the phone to your computer and download just the apps you want from it. iTunes "knows" about multiple devices and can keep them separate from each other.
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