IPhone 6 is not recognized on MacBook
My Macbook with OS X 10.5.8 does not recognize my iphone 6. I've been told I need to update. I'm looking for exact instructions on what version I need to update to and how to do this (disks, codes,etc). Also then do I need to update Itunes? I want to be able able to sync my music to my phone. If there is a different way to sync this music without having to spend money to update, let me know. But if not, I'd like to make sure I am doing the exact right thing to be able to connect the Mac and Iphone. Thanks for your help!
MacBook (13-inch Early 2008), Mac OS X (10.5.8)