[SABR42]

Hand 1:
Preflop and flop are obv fine. Against looser players you can bet the turn and shove river, but with his 12/6/1.5 stats, and no other reads, checking is probably best because these guys will fold 99 to a double barrel without history.

I would have raised a little more on the river, but as played it might be a fold. I really want to make a crying call and would probably call if I were at the table, but he's not going to 3-bet with worse hardly ever. His most likely hand is 77.

Hand 2:
I would raise slightly more on the flop the first time, just to bloat the pot a few dollars more to set up a bigger pot for later streets. I like the flat-call after he makes it $50, because he has plenty of room to get away if you shove (it's a horrible play but bad TAGs do it).

Bet more on the turn, but you already mentioned that. Call river.