galaxy n900 AT&T Lollipop (5.0) root question

hello,
I have been visiting this website for a number of years and have really enjoyed the quality advice given by the users. I have rooted and flashed numerous phones for myself and the advice here makes it so easy especially for novices like myself


Anyways i have a new phone now, a Samsung-SM-N900A (note 3). and i have unlocked it to factory so i can use whichever sim card ( if that is of any good information to you).

Ok i really am thinking of updating the rom and rooting it and making it a little faster especially since when connecting to the pc it doesn't read as a SD card and so i can;t scan it. These are the specs and i hope someone can guide me in the proper way to root and possibly a custom rom.

Model number: Samsung-SM-N900A
Android Version: 5.0
Baseband version: n900AUCUEOC2

Kernel Version:
3.4.0-4335446
dpi@SWHD4309 #1
Fri Jul 31 21:47:49 KST 2015

Build Number: LRX21V.N900AUCUEOC2

i hope this is enough information. I ave seen others with the build number OC1 and so on getting told that they cannot root their's. hopefully i can. Thanks alot in advance


-Kid