How to backup my new iphone to my old backup?

So basically i want to get the new iphone 5, when i do i plan to use my previous phone backup. The only thing i'm not really sure about is the fact that i'm currently using icloud. With my new iphone, can i go to my icloud account and get everything, or how does it work?

For those that still would be confused, I want my new iphone to have my old iphones backup, which is icloud.

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When you plug it in to the PC with iTunes running, iTunes should ask you if you want to restore it using the existing backup. If you're unsure of the mechanics of this, talk to the store rep. Most sellers; AT&T, Apple, will walk you through it.