Mordor 500 points

[SaintSlayer]

Hi everyone, I'm new to the forums and I'm glad to see support for WoTR here. Anyways I thought I would post up my 500 point starter army that I am going to use for an escalation league at my local GW store.

The Betrayer

Mordor Orc Warband
9 x companies with two-handed weapons

Warg Riders
6 x companies

Morannon Orc Warband
3 x companies with shields

So that's 500 points, and I plan on using the Orc with THW as the center of my army and then have the Warg Riders and Morannon's flank them and march across the field. The 9 company warband can put out a lot of attacks hit on 4's on average with re-rolls from the Betrayer . Also, should I break up the Warg Riders or keep them as on formation. Comments are welcome and thanks in advance!

***edit: sorry, I posted this in the wrong sub-forum, can someone please delete. Thank!