Switching itunes for iphone?

Hi so my dad got an iphone, used it for a few weeks, decided to switch, and gave it to me. I switched the carrier and etc. But now I'd like to put my own music on it, but to attach it to my itunes will erase some/all the information on it, my question is, what? I've already exported all the music I like, downloaded the photos, etc. But will I lose messages, notes, calendars? All that is what I'm curious about before I sync.

No just music on itunes

An iDevice may only sync by physical connection with one account one machine. When it syncs it will remove all the previous account data. If you already have those items just read them.