How to transfer everything from old iPhone to new iPhone?

I just got an iPhone 6 and the guy selling it to me set it up for me but i guess he didn't back it up in the initial set up and now i don't know how to get everything thats stored in the cloud form my old phone onto my new one.

Added (1). I just got an iPhone 6 and the guy selling it to me set it up for me but i guess he didn't back it up in the initial set up and now i don't know how to get everything thats stored in the cloud form my old phone onto my new one. Also, I'm already signed into my iCloud account.

Sign into your gmail account and your iCloud account on your new phone.

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