I'm not sure which of these I need – a push certificate or an API key. They appear to do the same thing, but I'm not sure what the difference is, or even where to find them.
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If you're developing an iOS app, you need to provide ExactTarget with a push certificate. ET signs your push message with this certificate so your app knows it's valid when received.
An Google Cloud Messaging (GCM) API Key is for Android apps.
As a side note, make sure you use the SAME Code@ AppCenter app for both iOS and Android. You can always segment by Platform later when sending a push message. You can also do sends to both platforms at the same time this way.