5NL -Needs help on the river

[checkmate36]

PokerStars No-Limit Hold'em, $0.02 BB (6 handed) Hand History converter Courtesy of PokerZion.com

saw flop|<font color="#C00000">saw showdown</font>

CO ($1.75)
Button ($2.06)
<font color="#C00000">SB ($6.05)</font>
<font color="#C00000">Hero ($5.58)</font>
UTG ($5.35)
MP ($1.48)

Preflop: Hero is BB with 5[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/heart.gif[/img]. CO posts a blind of $0.02.
<font color="#666666">2 folds</font>, CO (poster) checks, <font color="#666666">1 fold</font>, SB completes, Hero checks.

Flop: ($0.06) 2[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, Hero checks, CO checks.

Turn: ($0.06) 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets $0.04</font>, CO folds, <font color="#CC3333">SB raises to $0.12</font>, <font color="#CC3333">Hero raises to $0.3</font>, SB calls $0.18.

River: ($0.66) 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, Hero checks.

Opponent is 70/20. If I bet and he reraises I don't know if I can call his push so I just checked. If I don't know how to respond to a raise I will not bet at all. Bet half on this river? What if a villian CRAI?

Not sure if Im supposed to drop a stack here if it comes to that?

Final Pot: $0.66

[TKempf]

Bigger 3bet turn, I would make it .40 or more. Value bet river.