KK NL10, possible straight and flush draw
 

and here is another hand, now KK with 3 undercards on the flop:
I wanted to play it a bit soft to get some money in the pot, is it a mistake on this flop?

PokerStars No-Limit Hold'em, $0.10 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

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

UTG ($10.05)
<font color="#C00000">MP ($5.30)</font>
CO ($13.85)
Button ($8.90)
<font color="#C00000">Hero ($18.35)</font>
BB ($10.80)

Preflop: Hero is SB with K[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, MP calls $0.10, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $0.4</font>, <font color="#666666">1 fold</font>, MP calls $0.30.

Flop: ($0.90) 7[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $0.3</font>, MP calls $0.30.

Turn: ($1.50) 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $0.6</font>, <font color="#CC3333">MP raises to $1.2</font>, <font color="#CC3333">Hero raises to $3.6</font>, <font color="#CC3333">MP raises to $4.6</font>, Hero calls $1.

River: ($10.70) T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>

Final Pot: $10.70

Re: KK NL10, possible straight and flush draw
 

Never slowplay TP. Especially with a draw on the board.

Re: KK NL10, possible straight and flush draw
 

Bet more on flop. Never bet 1/3 pot and this board is really drawy.

Re: KK NL10, possible straight and flush draw
 

if you wanted to get money in the pot you should bet more on the flop. Any draw that's calling your meager bet will also call a PSB. With such a draw heavy board you also don't really want that much action. Especially OOP. With his little half a stack you want to charge him hard so he will most likely have to make a decision for his stack by the turn.

Re: KK NL10, possible straight and flush draw
 

Flop texture is very important in determining bet size. This is one of the most draw heavy types of flops, and it connects with many hands. So just pot the flop, and try to get as much money in against worst hands.