First off, I don't like being the bearer of bad news but in my opinion you made a mistake. In my opinion necrons have to be played at higher points values and be played by an experiences player to do well. Also, you can't be versing a high-caliber army with a high-caliber general behind it. Even a good general could pick you apart sadly.
Now, necrons CAN do well, here are two examples:
http://www.yesthetruthhurts.com/2009/08/battle-report-necrons-vs-iyanden.html and
http://www.yesthetruthhurts.com/2009/08/battle-report-necrons-vs-mech-eldar.html but that is at higher points levels...
Necron Lord - 140
Resurrection Orb
Warriors - 180
10x
Warriors - 180
10x
This is the only thing you can do for the most part. Your only other options are to:
Swap the Res Orb for 3x Scarab Bases, or 1 wraith.
Give the Necron Lord different wargear up to 40 points.
I think its going to be an horrible army for you to try and use. Any decent army could wipe you out. You got no mobility and nothing with a range over 24". You also have literally no anti-armor other than lucky gauss hits. Your highest strength weapon is 5 and thats a 12" staff of light. Basically I don't think you'll have fun vs. most people :(.
This kinda reminds me of me trying to play deathwing at 500 points. It's literally impossible (
lol) but even if you get an army out there it will get torn apart by most everything.