Can anyone please help me with my Sicilian openings. They are really complicated. There are too many of them. Please tell me the principles of them and post some decent variations. I know a bit on Nadjorf and a bit of Dragon but that's about it.

Open Sicilians:

Accelerated Dragon: 1 e4 c5 2 Nf3 Nc6 3 d4 cd4 4 Nd4 g6

The Accelerated Dragon delays moving the d-pawn in an attempt to play ...d7-d5 directly.  That usually is not accomplished but the Yugoslav Attack v the normal dragon is avoided.  The threat of ...d5 causes white to react to prevent it.  White can go 5 c4 ( Maroczy Bind ) or 5 Nc3.  Black pressures d4 with ...Nc6 and ...Bg7. 

Accelerated Dragon Maroczy Bind: 5 c4 Bg7 6 Be3 Nf6 7 Nc3 d6.  Is white's monolithic center a strength or a weakness?

Accelerated Dragon with 5 Nc3 Bg7 6 Be3 Nf6 7 Bc4.  Black is looking to avoid the Yugoslav Attack with an Anti-Yugoslav move such as 7...Qa5.

Dragon Sharp and dangerous.

Najdorf  The best according to many GMs.

Scheveningen  1 e4 c5 2 Nf3 d6 3 d4 cd4 4 Nd4 Nf6 5 Nc3 e6.  Allows the Keres attack 6 g4 which can be dangerous.  Many players reach a Scheveningen position from a Najdorf move order.  For example after 5...a6 6 Be3 then 6...e6.

Kan  1 e4 c5 2 Nf3 e6 3 d4 cd4 4 Nd4 a6 5 Bd3.  Black creates a bed of thorns with his pawns so that white's knights cannot invade.  The Kan scores highly for Black because white players are unfamiliar with how to attack it. 

Taimanov

Lowenthal

Kalashnikov

Sveshnikov  1 e4 c5 2 Nf3 Nc6 3 d4 cd4 4 Nd4 Nf6 5 Nc3 e5 6 Ndb5 d6.  White will get a strong knight on the d5 hole.  Black gets enough conterplay to compensate.  Main line: 7 Bg5 a6 8 Na3 b5 9 Bf6 gf6 10 Nd5.  Black will use the doubled f-pawns as a lever against e4 and try to undermine the d5 knight's support.

Classical

Other Sicilians:

Closed

c3 Alapin

Grand Prix

Rossolimo  1 e4 c5 2 Nf3 Nc6 3 Bb5.  Generally this is regarded as a way for white to get a draw.  But there is obviously plenty of opportunity for either side to go wrong.

Moscow 

Please will others help me flesh out this outline.  The Sicilian is a vast subject.

  I agree that it is vast. I hope someone would just write a site on the Sicilian covering everything.