First few hands at the table, so no read....bet more on flop and turn?

PokerStars No-Limit Hold'em Tourney, Big Blind is t20 (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP1 (t1470)
MP2 (t1160)
Hero (t1730)
CO (t1490)
Button (t1240)
SB (t1290)
BB (t1680)
UTG (t1450)
UTG+1 (t1980)

Preflop: Hero is MP3 with 3, 3.
2 folds, MP1 calls t20, MP2 calls t20, Hero calls t20, 1 fold, Button calls t20, SB completes, BB checks.

Flop: (t120) 8, 3, 7 (6 players)
SB checks, BB checks, MP1 checks, MP2 checks, Hero bets t60, Button calls t60, SB calls t60, BB folds, MP1 folds, MP2 folds.

Turn: (t300) 6 (3 players)
SB checks, Hero bets t160, Button calls t160, SB calls t160.

River: (t780) 2 (3 players)
SB checks, Hero bets t280, Button raises to t1000, SB folds, Hero ???

i would bet about half to 3/4 the pot on the end.... i also might have bet a little more on the turn maybe 200 or so.

I added a little bit more to what actually happened, I figured that its obvious the correct strategy would be to bet, but when I did bet, he raised...so then I was stuck...any ideas now?

with no reads this is really tough..... you wont be broke if you make the call. with around 500 still left u can still make a comback.. so i would probably have to call

I'd bet 100 - 120 on the flop. There's too many people for such a small bet. Your set's fairly vulnerable. I also bet about 2/3 pot on the turn. As played, on the river I bet about 500 and call any raise.

There's not very many boards I feel comfortably trapping on with a set, but this one does look fairly harmless, I'd still bet at least 3/4ths the pot since it's 6 ways, you've got to get a caller. The turn is a little tricky, with 2 callers I'm wondering what they could have, and I don't mind taking the pot down right here if you bet more on the flop, as played I'd bet at least 200. I honestly don't think you're behind on the river, if he made the straight I'd think he'd bet more for value, but I've seen worse plays. I call and I see an overpair sometimes, but most likely 2 pair. Oh well I suppose he might have an overset, in which case gg you.

I haven't read the replies, but:

STOP BETTING SO WEAKLY

arghh nah fold. He's representing a straight ie T9 and the way he's played makes sense and you let him hit by betting so weakly. Such a small pot on the flop with so many people you have to bet more. Its either a straight or a better set very rarely anything else. Pretty sure high pocket pairs would have raised preflop and on the flop.

Yup

Yup

Quoting other people and agreeing is all he does all day... No wonder his post count is so high

I'm not convinced. OP just bet 280 into a 780 pot. Pretty weak. I can see villain making a move here.

this was in the 3am Stars $11 MT, so I gues thats my only excuse for my betting so weak, I was pretty tired so I guess I just decided to see if I could spew $11. Looking back at my bets, I now realize just how weak they were...

Yup.