Game dynamics (and how bad is my play or is there something to say to it?)

Hi all. I moved up here to 10NL cuz I run so bad at 5NL at the moment (my bankroll is 40 buy-ins for 10NL by the way so guys, no worries)

Anyways. I sit down the table .. all unknown and get AJ in the SB.

UTG: 98.5 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 4)
CO: 100 BB (VPIP: 33.33, PFR: 16.67, 3Bet Preflop: 50.00, Hands: 6)
BTN: 217.5 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: -, Hands: 5) !! Its inportant that my opp has a big stack, a possible read that he's a decent player !!
Hero (SB): 100 BB
BB: 108.5 BB (VPIP: 25.24, PFR: 20.22, 3Bet Preflop: 6.79, Hands: 774)

Hero posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has J♠ A♥

fold, fold, BTN raises to 2.5 BB, Hero raises to 10 BB, fold, BTN raises to 23 BB, Hero calls 13 BB
So here I am, just new at the table. Good hand against a possible steal from a player with a BIG stack and BAM I get a 4 bet.
At that moment I thought this can mean two things. He plays is 4 bet range or he plays me and wants to make a statement against this new guy on his left.
I suspect it is the last so I call with intentions to bluff when there is an opportunity.

Flop: (47 BB, 2 players) Q♦ 2♠ 6♥
Hero checks, BTN bets 15 BB, Hero raises to 40 BB
I never ever would lead here so I check and when he does not jam I think I can test the water.
My bet size gives the impression I'll never go anywhere but of course would have snap folded to a jam.

My thoughts only AA KK QQ AQ have an easy call (and I block some of the AA AQ hands I assume Q2 and Q6 and 62 is not there and its unlikely 66 or 22 is there) .

Questions I have:
a) Would you have 4 betted with KQ as villain and if so, would you have called my 40BB bet with that hand?
b) Is my thought about dynamics a good thought at 10NL? I mean, would you 4 bet a new players re-steal light (I definitely do this at 2NL and I do it fast, I mean the first time I get 3 betted, to shut down the bullies).