How to use iCloud to transfer pictures?

Pictures, contacts, app data, things like that.
And how to transfer music to my iTunes.
I'm getting a new iPhone tomorrow and I don't wanna lose any of my data so how to I transfer everything without losing ANY data?

There will be large data. For restore with icloud.backup using itunes. But backup does not include apps. Just other data or transfer purchased app to itunes then restore it. Just sync it all dont forget do backup all phone let me know for more info