10 NL 6 Max, turned straight against possible flush on river

[snookAjab]

Full Tilt No-Limit Hold'em, $0.10 BB (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Button ($7.15)
SB ($9.70)
BB ($9.90)
UTG ($4.30)
Hero ($10.05)

Preflop: Hero is MP with 5[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/spade.gif[/img].
UTG calls $0.10, Hero calls $0.10, <font color="#666666">1 fold</font>, <font color="#CC3333">SB raises to $0.35</font>, BB calls $0.20, UTG calls $0.20, Hero calls $0.20.

Flop: ($1.25) 4[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, BB checks, UTG checks, Hero checks.

Turn: ($1.25) 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">SB bets $0.8</font>, BB folds, UTG folds, Hero calls $0.80.

River: ($2.85) A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $1.4</font>, <font color="#CC3333">Hero raises to $3.4</font>, <font color="#CC3333">SB raises to $6.8</font>, Hero calls $2.

Final Pot: $15.05

Should I have entered/limped this pot in the 1st place?
Would you have raised on the turn instead of the smooth call?
I don't like the way I made a scared call on the river, how would you have played it?

[shoxbb6]

don't limp/call pf/
plz,plz raise turn.
I fold to the river 3bet