Question [Q] SGH-I317m SuperSu Force Close

Hey guys,

Just bought this unlocked Note 2 (SGH-I317M) from someone. I had a previous note 2 that died.

I just rooted the phone to install a custum ROM. Right now I'm at the step where I just rooted it using
CF-Auto-Root-t0ltecan-t0ltevl-sghi317m.tar.md5 on odin 3.09.

I think the root went fine cause the Odin boxed said "pass".

When the phone reboots thought SuperSU is always force closing, so I cannot confirm the root process by going into Titanium Backup since SuperSu is closed.

If I install a custom rom, will that problem disappear?
How can I be sure that the phone has rooted properly?

Since I just bought it, I wish I would not brick it the first night!

Thanks for your time and knowledge!