Will syncing my iphone on my new mac make me lose everything?

I just bought a macbook air and i have my family's pc desktop also. I want to put everything from my iphone music, contacts, etc.onto my macbook air without having it getting deleted. I want to be able to put songs from my air onto my iphone. In the end I want to put everything from my iphone into my Macbook airs itunes, without loading my whole family's library on it as well.

Obviously.

Best way is to upload the iPhone to icloud then retrieve it through iTunes on the MacBook.