I have only been at the table for about an hour. I have a good image as I've already won a few small pots & one medium pot where I showed down AA. The villain is a young unknown kid who seems to playing too loose pre, with a mix of limping and raising. We are about $350 effective.
Preflop: he opens to $10 in MP. 2 loose, passive players call in the CO & OTB. I 3 bet to $55 in the SB with A♠ J♠ . Only the original raiser calls. Pot is about $115.
Flop is Q♥ 6♠ 3♦ .
My question is what c-bet size do you use & why?