T8s BB defence

[Obliky]

This is my very first hand at the table..i havent played against these guys before.

Ultimate Bet 0.50/1 Hold'em (6 handed) converter

Preflop: Hero is BB with 8[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/spade.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">MP raises</font>, <font color="#666666">3 folds</font>, Hero calls.

Flop: (4.40 SB) 3[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP bets</font>, <font color="#CC3333">Hero raises</font>, MP calls.

Turn: (4.20 BB) K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, MP calls.

River: (6.20 BB) A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks...

Is it worth having a bluff at the river?
How about the rest of the hand?