LIMCASH 1st 2 hands in matchup, marginal vs unknown

[kamel]

Both hands were played basical at a 2/4 FR table that I just had opened yet, but situation should be similiar to the beginning of a heads up. Villain was unknown.

I always feel unsecure how to handle those hands, so I hope to get here some hints.

1) PokerStars 2.00/4.00 Limit Hold'em <font color="#0000FF">(2 handed)</font> HandRecorder v0.9b

Preflop: Hero is SB with 7[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/heart.gif[/img]
<font color="#FF0000">Hero raises</font>, BB calls.

Flop: (3.50 SB) 9[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#FF0000">Hero bets</font>, BB calls.

Turn: (2.75 BB) J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, Hero checks\.

River: (2.75 BB) T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, Hero checks\.

Final Pot: 2.75 BB.

2) PokerStars 2.00/4.00 Limit Hold'em <font color="#0000FF">(2 handed)</font> HandRecorder v0.9b

Preflop: Hero is BB with 8[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/diamond.gif[/img]
<font color="#FF0000">SB raises</font>, Hero calls.

Flop: (3.50 SB) 8[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#FF0000">SB bets</font>, Hero calls.

Turn: (2.75 BB) T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, SB checks\.

River: (2.75 BB) 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, SB checks\.

Final Pot: 2.75 BB.

In hand 1) I guess, I should have bet the turn and call down if he c/r me, as played I should have valebettet the river. Right?

In hand 2) I guess, checking the turn is fine, but after he checks behind the turn, I should have valuebettet the river for my own with a hard decision if he raises me on the river. Right?