Hand 1 and 2 look good and 4 I'd c/f turn.

Hand 3 is the most interesting imo.
If you're calling this hand preflop you can't rely on implied odds alone, and if you're not doing something on these flops I think your call will not be profitable. My standard would be to just fold preflop because I have no clue what my possibilities are of exploiting this villain postflop, because there's no history.

But because you called preflop you should do something on a board like this.
- A lead will only fold out worse hands and risks getting bluff raised by a maniac.
- Your draw is likely not strong enough for a c/c and you're prone to getting barreled of your hand a lot by an aggressive villain
- A c/r reps reasonable hands and you can barrel a lot of turns. How light villain cbets this board and calls a c/r you don't know, but that's the downside of calling with little history.