NL noob seeking advise on correct bet sizes pf & flop

[Jaran]

CO is very loose (66.7/21.3/1.11 over 75 hands). Also is trying to be the table captian. I've noted s/he plays any two sooted, and will always call a reraise after commiting money on a given round. My main question is about the size of the flop bet, or if I should check. Also, I'm unsure about how much to 3bet here pf.

-J


PokerStars No-Limit Hold'em, $0.05 BB (8 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP2 ($6.19)
CO ($5.39)
Button ($5.26)
SB ($5.78)
Hero ($12.11)
UTG ($12.44)
UTG+1 ($5.78)
MP1 ($5.85)

Preflop: Hero is BB with A, A.
[color=#666666]4 folds</font>, [color=#CC3333]CO raises to $0.25</font>, [color=#666666]2 folds</font>, [color=#CC3333]Hero raises to $0.7</font>, CO calls $0.45.

Flop: ($1.42) J, K, 7 [color=#0000FF](2 players)</font>
Hero...