Standard.

It's 10NL... don't get tricky.

1. Depends on your read. Bet as much as you think he'll call. At least $4... or if you think he'll bite, just shove it in. The nice thing about the overshove at these levels is that they will get called (esp if he's sitting on like Q or J of spades) enough times to make them +EV...
2. Meh... I prolly check/call. If he flopped the flush or AT 2pr then nh. At least I'm not getting shoved over. There are enough busted FDs in his range and AQ/AJ type hands to make it worth calling a reasonable bet.
3. nh