Positive wire from the amp to red terminal. Black terminal to red terminal with dot. Black terminal with dot to negative on the amp.
Repeat for sub 2.
Win.
That'll only give you 250w per sub, but you can't wire it to 1 ohm per channel or bridge at 2 ohms. Your best bet is to get a 2 ohm stable mono amp. I'd recommend a ZX1000.1 or a ZX750.1