First day at 50nl

[CallYNotRaise06]

Seat 1: hero ($50.25)
Seat 6: Villain($119.35) no reads, its only my 2nd hand at the table
hero posts the small blind of $0.25


Dealt to hero [K [img]/images/graemlins/spade.gif[/img]9 [img]/images/graemlins/diamond.gif[/img]]
Villain calls $0.50 on button
hero calls $0.25
BB checks


Flop [9 [img]/images/graemlins/heart.gif[/img] 7 [img]/images/graemlins/spade.gif[/img] K [img]/images/graemlins/heart.gif[/img]] <font color="red"> 1.45 </font>
hero bets $1.45 Villain calls $1.45


Turn [Q [img]/images/graemlins/diamond.gif[/img]] <font color="red"> 4.30 </font>

hero bets $3.50 Villain raises to $7 hero calls $3.50


Do you just call here or 3 bet?

*** RIVER [J [img]/images/graemlins/spade.gif[/img]] <font color="red"> 18.00 </font>


hero checks villain bets $20 hero ....

What are we putting villain on here, and do we call this bet?