Standard 10/20 preflop play?

[Mr. Curious]

It has been a while since I've played limit, so I thought I'd double check a few preflop decisions from today:

Live 10-20
9 handed

Hand 1:

My first two hands (BB & SB) resulted in chops. This is my third hand at the table.

Hero is on the button with 66

Preflop: Folded to CO who raises, Hero folds...

<In hindsight, this could have been a steal. Was Hero's fold correct or would the better play have been to 3-bet (or just call)?>

Hand 2:

MP2 is a thinking TAG.

Hero is the SB with AQo

Preflop: UTG raises, UTG+1 folds, MP1 folds, MP2 (TAG) 3-bets, MP3 folds, CO folds, Button calls, Hero folds...

<I'd have called if it was suited, but I'm used to NL and this hand is toast to a re-raise (and most raises)>

Hand 3:

Hero is UTG+1 with KQo

Preflop: UTG calls, Hero calls...

<Should this be a raise rather than a call?>