I am just learning to play fantacy and could do with alot of help with this army and suggestions on the best way to use Tomb Kings.

For this army i am focusing on shooting and magic so any tips on how to improve on this would be great.

Well heres what i got:

Lord:
High Queen Khalida A Neferher

Hero:
Liche Priest
Liche Priest

Core Units:
20 x Skeleton Bow Warriors
Blessing of the Asp
20 x Skeleton Bow Warriors
Blessing of the Asp
20 x Skeleton Bow Warriors
Blessing of the Asp
20 x Skeleton Bow Warriors
Blessing of the Asp

Special Units:
Tomb Scorpion
Tomb Scorpion
Tomb Scorpion

Rare Units:
Screaming Skull Catapult
Screaming Skull Catapult

1885

That leaves me with 100pts to give my liche Priests 50pts worth of wargear each and then 15pts to put somewhere else.
So the idea im having is i stay at the back and let everything come to me while i shoot it to death. The Tomb Scorpions are for tieing up units and cannon hunting an the like.
So how do you guys think this list would fair and how can i make it better?