So I think that a much better list would be...
-Shargrat war leader 110pts
-The Knight of umbar/ The shadow lord 120pts (cant decide)
-14 Black Guard 168 pts
-16 Orc Warroirs 96pts
-spears
-10 Orc Trackers 50pts
-bows
-4 Warg riders 56pts
-throwing weapons

total
600pts

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top quality commissions Tiny prices

Looks good. I was little concerned about the lack of numbers for a Mordor army but the Black Guard should make up for that.

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"There are few left in Middle Earth like Aragorn, son of Arathorn." - Gandalf, Many Meetings