Check or bet turn against new player?

[chanchuan]

I definitely bet the turn, although two draws just got there. I think he might have a small PP or something like A2, A9. The river minbet is essentially a check and I'm usually checking behind (possibly losing tons of value?? but he might of course be going for a check-raise w/A6)

On a side note: I'm not sure if a lot of villains would pull of a check raise on the river with trips on a 3-flush and straighty board.