Relatively new to this site and (compared to the guys I play with) new to Warhammer
40k. I've had a few battles and through trial and error, learned much about Necrons. Here is a basic list that can stand as the "backbone" which can be broken down and easily modified depending who I'm playing against. The main armies my friends play are Blood Angels, Orks, Tau, Grey Knights, Tyranids and lastly the tricky Eldar. Feel free to post your opinions and/or suggestions on what to change in this list to better suit myself versus the different teams I mentioned.
Necon 1500 Pts
HQ:
Necron Overlord (220 pts)
-Sempiternal Weave
-Mind Shackle Scarabs
-Phylactery
-Warscythe
-
Catacomb Command Barge as Dedicated Transport
-
Exchanging Gauss Cannon for Tesla Cannon
Royal Court:
Cryptek (40 pts)
-Harbinger of Despair (I made a mistake when initially making this list. I thought Nightmare Shroud gave its unit Stealth...

)
-Nightmare Shroud
-Cryptek Royal Courting with
Immortals
Cryptek (60 pts)
-Harbinger of Despair
-Veil of Darkness
-Cryptek Royal Courting with
Deathmarks
Troops:
Warriors x10 (245 pts)
-
Ghost Ark as Dedicated Transport
Warriors x10 (245 pts)
-
Ghost Ark as Dedicated Transport
Immortals x10 (270 pts)
-
Exchanging Gauss Blasters for Tesla Carbines
-
Night Scythe as Dedicated Transport
Elites:
Deathmarks x7 (233 pts)
-
Night Scythe as Dedicated Transport
Fast Attack: (180 pts)
Heavy Destroyer x3
Total Points: 1493
Feel free to tear apart at your own desire.

Main focus is possibly switching Elites and Fast Attack for something more practical depending on what army I am against.