Main villain and original opener is playing 21/15 with a 22% open from MP. He's folding to 3Bets ~60%

So this hand I decide to 3Bet to hopefully just collect all that dead money. Can I get some thoughts on this? Who just flats in this spot?

On the flop I figure to have the best hand most of the time, so I bet slightly less than half pot for value/protection, and he calls.

Questions:

1) Hows the flop cbet?

2) What is my turn plan? (will give thoughts after)

PokerStars Zoom No-Limit Hold'em, $0.25 BB (9 handed) - PokerStars Converter Tool from http://poker-tools.flopturnriver.com/Hand-Converter.php

Button ($54.28)
SB ($28.69)
Hero (BB) ($25)
UTG ($15.78)
UTG+1 ($25)
MP1 ($88.37)
MP2 ($25.81)
MP3 ($10.55)
CO ($96.10)

Preflop: Hero is BB with J, A
3 folds, MP2 raises to $0.75, MP3 calls $0.75, CO calls $0.75, 2 folds, Hero raises to $4, MP2 calls $3.25, 2 folds

Flop: ($9.60) A, 9, 10 (2 players)
Hero bets $4.50, MP2 calls $4.50

Turn: ($18.60) 6 (2 players)
Hero's plan is?