How to play this measure with left hand? Also which finger for each note? Thank you!
Pretty straightforward - pinky for the low G, pedal down immediately, to hold it. Then choice - either move l.h. to play the arp. starting on D with pinky again, then middle, index, thumb; or D with middle,thumb plays upper G, then over with whatever you fancy for the last two. The pedal stays down until the beginning of the next bar, and changes just after you hit that low G again, as the whole bar makes a G minor.
With fingering 'problems' like this, it's far better that the player works out his/her own. After all, they're the one playing it, and a little experimentation is good for progress and experience. After all, you could have two concert pianists with completely different ideas with such as this. Which might you choose?