GAP Theory

[the wheel]

Here is the situation: the game is no limit / tournment 25.00 buy in 300 / 600 blinds
stacks range from 3,600 to 24,000 my stack small and I am against the big stack.

UTG : folds
Player 1: calls the 600
player 2: bets 1200 AQs(huge stack 24,000)
player 3: folds
me : Ad,Js, short stacked all in
player 4: fold
player 5: fold
SB : folds (300)
BB : folds (600)
to call
UTG :folds
flop comes Kd,As,10x, turn 2s, river 3d

Question: Was I wrong to go all in in this situation?
Question: I want to read a good article on GAP theory and its applications,could someone help.

TW