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Alright so I'm not so sure what list to make if you have any ideas lmk. This is my current collection.
40 warriors Flayer
20 warriors Reaper
20 immortals tesla
10 immortals gaus
I have three Overlords
2 crypts
Skorpekh lord
6 tomb blades gaus
6 wraiths
12 scarabs
6 Lokhust destroyers
6 Skorpekh destroyers
C'tan shard Nightbringer
C'Tan shard deceiver
10 Death marks
2 Canoptek doom stalkers
1 Annihilation barge
1 triarch stalker gauss
1 Monolith
1 ghost ark
10 lychgyard, sword and board or warscythe

I'm nowhere near an expert, but as a big fan of melee Necrons, I would run something like this:

1 Battalion Detachment: (You could go the standard Novokh which is really good for close combat, but I personally like a custom Dynasty with Rad-Wreathed and Relentlessly Expansionist. I find that Rad-Wreathed of giving -1 T in engagement range tends to be better than the -1AP on the charge. I also tend to like the pre-game move over the +1" to charge. Less good for Deep Striking units, but gets you on objectives and to your opponents with non-Deep Strikeres faster.)

HQ
Overlord with Voidscythe/Res Orb: 140 Pts.

Technomancer with Canoptek Cloak/Control Node: 95 Pts.

Skorpekh Lord: 130 Pts.

Troops:
10 Immortals with Gauss: 170 Pts.

2 units of 10 Warriors with Gauss: 260 Pts.

Elites:
10 Lychgaurd with Sword and Board: 280 Pts.

6 Skorpekh Destroyers: 210 Pts.

Nightbringer: 370 Pts.

Fast Attack:
9 Scarab Swarms: 135 Pts.

6 Wraiths: 210 Pts.

The only thing I'd change from this list with what you don't have would be to split the Immortals into two units of 5 (so you keep your 3 troop choices) and swap 10 Warriors for 10 Flayed Ones.

Basically the Immortals and warriors hold down the backfield objectives and take pot shots while the rest attack in three groups. The Skorpekhs, the Overlord with the Lychguard, and the Technomancer with the Canoptek units. The Nightbringer just goes wherever the fighting is the thickest and kills all the things.

Well, I suggest to have a look into the recent GT winning lists at 40kstats.com.
It will give you some hint how to configure a successful army, incl.
detachments, dynasties, Warlord traits, and relics.

Well this is what I put together from looking at those lists you said to check out.

++ Battalion Detachment 0CP (Necrons) [105 PL, 11CP, 1,999pts] ++

+ Configuration +

Battle Size [12CP]: 3. Strike Force (101-200 Total PL / 1001-2000 Points)

Detachment Command Cost

Dynasty Choice: Dynasty: Novokh

+ HQ +

Chronomancer [4 PL, 80pts]: Entropic Lance

Overlord [6 PL, 130pts]: Relic: Sempiternal Weave, Resurrection Orb, Warlord, Warlord Trait (Codex 3): Immortal Pride, Warscythe

Skorpekh Lord [7 PL, -1CP, 130pts]: Dynastic Heirlooms, Relic: Veil of Darkness

+ Troops +

Immortals [4 PL, 85pts]: Gauss Blaster, 5x Immortal

Immortals [8 PL, 119pts]: Gauss Blaster, 7x Immortal

Necron Warriors [6 PL, 130pts]
. 10x Necron Warrior (Gauss Reaper): 10x Gauss Reaper

+ Elites +

Canoptek Plasmacyte [1 PL, 15pts]

Skorpekh Destroyers [10 PL, 210pts]
. 2x Skorpekh Destroyer (Reap-Blade): 2x Hyperphase Reap-Blade
. 4x Skorpekh Destroyer (Thresher): 4x Hyperphase Threshers

+ Fast Attack +

Canoptek Scarab Swarms [6 PL, 135pts]
. 9x Canoptek Scarab Swarm: 9x Feeder Mandibles

Canoptek Wraiths [10 PL, 175pts]
. 5x Canoptek Wraith (Claws): 5x Vicious Claws

Canoptek Wraiths [10 PL, 175pts]
. 5x Canoptek Wraith (Claws): 5x Vicious Claws

+ Heavy Support +

Canoptek Doomstalker [7 PL, 140pts]

Lokhust Destroyers [18 PL, 330pts]
. 6x Lokhust Destroyer: 6x Gauss Cannon

+ Dedicated Transport +

Ghost Ark [8 PL, 145pts]

++ Total: [105 PL, 11CP, 1,999pts] ++

Created with BattleScribe

I can tell you from personal experience two things about Necrons:

1 - Wraiths and scarabs are so fast and hard to kill, its a great part of ANY list. (They really like the technomancer with control node too).

2 - Doomstalkers are swingy due to the D6 number of hits, but x2 or x3 with a Technomancer control node = Daaaaaaamn!!!!

Oh gak that sounds good I just need to get a few more then.