Another wait till the turn hand

[SlantNGo]

First hand at the table, I posted in the CO. Up to that point I had about 10 hands on UTG, VPIP 50%, no pre-flop raises from him yet.

Party Poker 1.00/2.00 Hold'em <font color="#0000FF">(9 handed)</font> link

Preflop: Hero is CO with 8[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#CC3333">UTG raises</font>, MP1 calls, <font color="#666666">2 folds</font>, Hero calls, <font color="#666666">1 folds</font>, SB calls, BB calls.

Flop: (10.00 SB) 6[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, BB checks, <font color="#CC3333">UTG bets</font>, MP1 calls, <font color="#CC3333">Hero ???</font>

I chose to raise right away because that gave me the opportunity to knock out SB and BB NOW, potentially cleaning up a 7, and any overs. I think this is a CLEAR flop raise, but I'm afraid I don't understand this topic well at all.

A month ago I would have waited till the turn here because my edge is small here, and a "blank" increases my equity tremendously, while a 4, 7, or 9 leaves me probably drawing dead.