Default [Q] Need assistance on rooting my Note 2 n7105

Hi, I have a Note n7105 running on 4.3. Wan to try rooting my set to put in custom ROM to try.

Can anyone point e in the right file to download the correct file to root my phone?

Can I install custom from 4.2 when I am in 4.3 now?

Hope to get advise soon. Thanks