1. In the first hand with 5h6h, if the board bricks turn and river do you still make a bluff on the river? Are you more likely to do this if one of the cards is an offsuit K as this will make him less likely to call with AJ and QQ knowing that he now loses to Kxs?
Probably not. An offsuit K doesn't really change anything from his perspective, the only Kx we'd have would be Kx with whatever FD was out there. In short, if he's calling so we can semi-bluff, he should really like big off suit cards, not be afraid of them.
2. In the same hand, apart from sets, 2 pair and big draws, what is a good range to raise the flop with? Do you do this with a hand as strong as AJ or a hand as weak as 7h8h or 22?
8h7h would be a good hand to raise with, as long as you're going to rep spades along with what you actually have. 22 would be fine to turn into a bluff, as long as you're not just "one and done". This is assuming villain can hand read and isn't a station. Raising AJ isn't really optimal unless you have such a history that villain will not believe you, or if you have a read that he's just going to fastplay worse made hands, which is pretty unlikely. There is much less onus on you to make better hands fold at some point if you already have TPTK.
3. At the 19min mark where you have AhKs, do you think this villian ever leads the turn with a hand like 99-JJ thinking that he has a decent shot at having the best hand, he probably has some outs if he doesn't have the best hand and it prevents him from getting bluffed off the best hand? How does your plan for the hand change if he leads turn?
It would be pretty rare for villain to donk lead this turn OOR. Typically it's something I would expect a fish to do quite often with exactly that range. That's not to say it's a horrible play because it doesn't have to be. It all comes down to what you expect the 3bettor to do. If you think he would never, ever bluff the turn, leading to control the size of the bet/protect your hand can be good. I don't particularly like leading as a bluff on the turn because a lot of regs are going to enter confusion/level myself call mode. Against this particular villain I jam if he leads the turn, against someone else it could be an easy muck.
4. In your first hand against play2winSerbia do you ever bet/3-bet and call a shove with top pair on this dry of a board (K83r) against this sort of player without any history?
Yes, often. Reraising the flop small does a better job of repping air than calling.