Well, I actually would have folded preflop, but that's past at this point. The fact is though, short of flopping a set, this is the best flop that you really could have hoped for. You have 3 under cards, and with a preflop raise, the chances that anyone has a 63 or 68 for a straight is pretty low. Now, the thing you have to be worried about is a set or a pocket pair higher than yours. If you thought someone might have a higher pocket pair, then you should have folded preflop, so unless your read has changed, it's time to figure out if you're up against a set or not. Now, this is nearly impossible to do since you're first to act (another reason why I would have just folded preflop, but again, that doesn't matter at this point). If you want to bet, you have to decide how you'll react to a raise. At this point there should be roughly 2500 in the pot, so lets say you plan on betting out around 1500 or so. Before you make the bet, you have to know what you'll do if someone a) raises to between 3K and 4500 or b) takes you all in. If the answer to a is that you'd fold, then you shouldn't make the bet. If you aren't willing to push, then it's still not a terrible bet to make, but that's only if you feel like you can get back into the tournament with the 7500 or so in chips that you would have left. So, after thinking ahead, if you're willing to call a raise, then you should probably bet out. Otherwise, just check and maybe see a free card and hit a ten.
edit: I didn't see the 2nd page, but this is my analysis for post flop
Anyway, now here's my advice for the turn:
The turn is a really good card for you. Chances are, if someone only had a pair of 4s, they probably would have folded on the flop. You still have a pocket over to the board. And possibly most importantly, the flush draw didn't hit (yet). Now, you need to make a big enough bet that someone with a flush draw isn't getting equity to call (which you didn't do on the flop). You should bet out half the pot at this point. While this might scare off a hand like A7, it's worth it to get rid of the flush draw. Also, since no one raised on the flop, you should be relatively sure that your hand is good at this point (its possible someone has JJ but I doubt it). Slow playing a flop that's 5-handed would be completely foolish, so if someone hit a set on the flop, they'd probably have raised you. Make a strong bet here, don't give draws equity to call, and if you don't get a caller, that's perfectly fine.
