The funny thing about 99-JJ is that if an ace, king or queen come on the flop - you're often good. Especially heads up. Your opponent may have played A7o, but he may also have played 55 or 76s. Representing the high card on the flop is often a profitable move. You'll need to know your opponents - you need to have an idea if a call on your bet means that he has the top pair only, or if he'd call a single bet with any middling pair also (or with draws).

Hand 1:
Ok a TT hand can be played as a small pocket pair for implied set odds, hoping to make an overpair or in position to have steal equity compensate for when you get beaten on the flop. In this hand you're not in position with an UTG raiser. SB is short, so you don't want to play a set against him for implied odds with anything above the current bet (2bb) and that's pretty borderline. If you end up against UTG your stack is the one limiting the implied odds and for implied odds alone you can probably profitable have the raise size be to $0.15-$0.16. You need to think about what you are trying to accomplish when you raise. Are you trying to juice the pot so you can win a bigger pot? If so, you succeed at juicing the pot - and the implied odds on making a set does justify this approach. Do you raise hoping to isolate one of your opponents? Then you are re-raising too small an amount imo. To isolate you'd probably have to raise to something like $0.20 in this situation. This would see you gambling against SB if an overcard comes on the flop, and would define UTG's range as strong enough that you can accept the reduction in implied odds for your set. Based on the play I'd expect UTG in this case to call (or re-raise) and SB to fold. I think my problem with the pre-flop raise size is that it doesn't really help you define the ranges of any of your opponents.

On the flop you have a hand with showdown value, but the board has some draws and an overcard. As played I would bet this flop $0.30. I would be pricing out the draws (two hearts, the occasional 65 hand probably in SB rather than UTG). If UTG folded and SB raised me all-in I'd call (I would be pot committed due to his short stack size). If UTG raises me and SB called I'd probably fold. If UTG raises and SB folds - I'd need to know something more about UTG. If he's reasonably tight and straightforward I'd probably fold, but if he tends to fall in love with drawing hands or middling pairs I'd have to consider the amount he raises me to and what my price to continue in the hand is going to be.

As played I fold to his massive overbet.

Hand 2:
Pre-flop is fine, but I don't like the flop check. There are two clubs on the flop and any KJ or J9 hands (both certainly possible for both opponents) have an open ended straight draw. Combination draws are possible (Kc9c, AcKc etc). So you need to bet to price out drawing hands. The second reason that betting is likely to be profitable is that you will be called by anyone holding a Q. I'd bet $0.20 in this situation. Let's be clear - when you hit your set on the flop you are looking to get your whole stack in there and you have two things to consider as you are aiming for this goal: 1) don't let anyone draw cheaply to beat you. If they pay the wrong price to a hand that ends of beating you you will still have played the hand the best way. 2) get the opponent to put all the money in the middle, either by making bets and raises or calling bets and raises. On the flop the pot is $0.25 and the stack behind is $1.83 - you will need 3 bets or raises of significant size to get the stacks in. The more money you get in on early streets the easier it will be to get the rest in on later streets (as the pot becomes big and bets are relative to the pot). As played on the flop I'd raise the flop to $0.40. Checking to the pre-flop raiser may be correct only if you think there's a very big chance that he'll bet.

Turn brings an ace, which completes a straight draw (KJ), provides another overpair option (good for getting your bets called) and provides some two pair options (AQ, AT) which will definitely call to stack off. Good card for you to get value out of the hand - even the completed straight gives you 10 outs to quads or a full house so it's not lost yet. As played - lead the turn for $0.40, which allows the rest to go in on the river if called. As played - raise turn to something like $0.60 which should be callable and guaranteed to get the rest in on the river.

River brings a complete blank that changes nothing. As played ok maybe I check the river to induce a bet which I can then raise. I wouldn't object to a lead up to $1 or even and open all-in push, but I guess those would give the opponent an actual chance to fold which he doesn't need. But when he does bet the raise size should be all-in. It's not even much of an overbet - it's pretty much a PSB sized raise.