How to put my music on my iPhone from my MacBook Pro?

I just got the iPhone SE and I'm having trouble putting my music on it. Whenever I plug my phone into my computer it says that the iTunes version on my iPhone is outdated but i'm 99 percent sure its the most current one. Also I'm not sure if this affects it but I have different apple IDs on them. Any advice?

OK, no need for any of us to try to explain to you that useing a bunch of Apple IDs is crazy.

Just skip all of the apple plan entirely and use third-party software…
http://www.macroplant.com/iexplorer/ (iExplorer, free, for OS 10.6 or later)
https://www.macroplant.com/phonedisk/ (PhoneDisk, free for OS 10.5 Intel)

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