Set on a suited flop

[feroder_zb]

It is early on as you can see, no reads on villain. I usually limp mid/low pockets this early on, especially with so many limpers already, is that correct? I know that my flop bet was too big and the push probably a disaster, but how do I play these hands? I'm a new poster, by the way, so any feedback would be great, thanks.

PokerStars No-Limit Hold'em Tourney, Big Blind is t20 (8 handed) converter

Hero (t1480)
BB (t1950)
UTG (t2020)
UTG+1 (t2290)
MP1 (t1370)
MP2 (t1320)
CO (t1690)
Button (t1380)

Preflop: Hero is SB with 8[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">2 folds</font>, MP1 calls t20, <font color="#666666">2 folds</font>, <font color="#CC3333">Button raises to t80</font>, Hero calls t70, BB calls t60, MP1 calls t60.

Flop: (t320) 7[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero bets t320</font>, <font color="#CC3333">BB raises to t640</font>, MP1 folds, Button folds, <font color="#CC3333">Hero raises to t1400</font>, BB calls t760.