I'm assuming you're playing at the micro tables. I think calling in position with that type of hand is ok, you still have to look at a few factors that are different every hand. One of the things is the effective stack size (= the smallest of the two stacks in the hand, assuming it's heads up after the flop), this needs to be enough to make these plays worthwhile.
Unless you're a fairly skilfull player, I suggest you stick with the small pocket pairs in these situations, they're a lot easier to fold after the flop if you miss. As opposed to suited connectors and suited aces who are very difficult to play in some situations, play these hands when the stacks are very deep.
In the first example, you completely miss the flop, and you can lay down with no second thoughts, this is why these hands are called speculative hands, the goal is to hit hard or miss (catching a small piece could be trouble for you). Don't worry about losing this pot, keep the money for a future, more profitable spot. At the micros you should be thinking fat value.
In the second example you hit the flop fairly hard but you still don't have a made hand (a situation that will happen often with this type of hand), you're hoping to either build a big pot in case you make your hand, or get your opponent to fold his weak made hand, so the answer is aggression (if you're playing an opponent that calls with anything, then forget this unless you have a hand that is a favourite to win).
BTW I don't think anybody at that level is going to fold QQ on that flop, it's just not going to happen (unless there is a huge check raise involved, even then), so in this situation, assuming you can put him on such a precise hand, aggression won't do.
The 3 bet idea is open for debate (like everything I have said of course), I don't think there is a clear right answer and it's very opponent dependant (can you say that ?). Personally at the level I play I wouldn't 3 bet this hand in that situation, it's a call or fold for me (a lot more folding than calling).
Hope this helps