nl 20 common situation with overpair in 3bet pot

[Kukla]

Villain is 31/14/2.6 (2.6/2/4) AttST 20% WtSD 43.7%!! W$aSD 50% 235 hands
My stats is 21/15/2.7

iPoker No-Limit Texas Hold'em (NL20), $0.20 BB (4 handed) SilverKitty Hand History converter by www.pokeronline.com.ua

CO($32.22)
Hero($19.9)
SB ($6.73)
BB ($38.43)

SB: Post SB $0.10
BB: Post BB $0.20

Preflop:
Hero is Button with T[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/diamond.gif[/img]
<font color="#CC2222">CO Raise $0.8</font>
<font color="#CC2222">Hero Raise $2.4</font>
<font color="#666666">2 folds</font>
CO Call $1.6

Flop:($5.1) 7[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/club.gif[/img]<font color="#0030DD">(2 players)</font>
CO Check
<font color="#CC2222">Hero Bet $5</font>

It s pretty standart but i have following questions:
1.What to do when unknown willain raise me on this flop???
2. What to do when this willain raise me on this flop? And i know that sometimes he make this with AQ e.t.c. but don t know how often he can do it [img]/images/graemlins/smirk.gif[/img]
3. What my plan to the rest of the hand, when he just call me.