50NL-classic flush draw situation

[supercheval]

I feel my biggest leak is playing big draw like this one, I felt totaly lost during that hand... Every street could be wrong and I wouldn't be surprised. The villain in this hand is a tag.
Is the flop call good? Should I have shoved instead? Should I have folded instead? why?
On the turn, I felt that it was obvious that I had a flush so I decided to check.. is this stupid?
On the river, I feel that my bet was too small because at that point, I was pretty sure he had an ace.

PokerStars No-Limit Hold'em, $0.50 BB (4 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

SB ($59.95)
Hero ($99.45)
UTG ($46.45)
Button ($55.55)

Preflop: Hero is BB with T[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Button raises to $2</font>, SB calls $1.75, Hero calls $1.50.

Flop: ($6) 7[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets $4.5</font>, <font color="#CC3333">Button raises to $13</font>, SB folds, Hero calls $8.50.

Turn: ($32) Q[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, Button checks.

River: ($32) A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $15</font>, Button calls $15.

Final Pot: $62