Move iTunes Library from PC to MAC
I want to be able to sync my phone into my mac but I don't want to lose all my stuff that I have on my phone and ipad.
There are also these...
Recovering your iTunes library from your iPod or iOS device
Syncing to a New Computer...
What if I bought my Mac off of Craigslist? There was a former owner and she sold it to me.
Then the Mac should have been restored to Factory Settings before it was sold...
If it wasn't .. You should do that now.
Read Here > What to do before selling or giving away your Mac
ALSO See Thomas Reed's How to Prepare your Mac for sale