NL50: 2 TT hands

[CaptUnlucky]

I'm gonna post a while bunch of hands in the next few days cause I'm really picking through my game. Help on all these would be greatly appreciated, I'm going nuts in the middle of this.

Here's some TT hands I believe I misplayed:

1) Villain is unknown (only 20 hands)

Party Poker
No Limit Holdem Ring game
Blinds: $0.25/$0.50
6 players
Converter (http://www.neildewhurst.com/hand-converter)

Stack sizes:
UTG: $21.86
UTG+1: $41.55
CO: $70.39
Hero: $51.10
SB: $60.13
BB: $55.75

Pre-flop: (6 players) Hero is Button with T/images/graemlins/diamond.gif T/images/graemlins/spade.gif
<font color="#cc0000">UTG raises to $1</font>, 2 folds, <font color="#cc0000">Hero raises to $4</font>, 2 folds, UTG calls.

Flop: 7/images/graemlins/club.gif 8/images/graemlins/diamond.gif 6/images/graemlins/diamond.gif ($8.75, 2 players)
UTG checks, <font color="#cc0000">Hero bets $7.5</font>, UTG calls.

Turn: Q/images/graemlins/diamond.gif ($23.75, 2 players)
UTG checks, Hero checks.

River: A/images/graemlins/heart.gif ($23.75, 2 players)
UTG checks, Hero checks.

Results:
Final pot: $23.75

2) Villain is 24/17 (sorry no converter)

Hero: Ts Th


Pre-flop:

Hero raises to $2. Villain re-raises to $5.
4 folds, Hero calls.

Flop (board: 8s 4c 6d):

Hero checks. Villain bets $7. Hero calls.

Turn (board: 8s 4c 6d Js):

Hero checks. villain bets $10. Hero ???