You will need a 1/2" FPT to 3/8" Flare (45 degree) fitting, assuming the regulator has a 3/8" flare end.
This is a male fitting:
They are typical on gas appliances such as your range, furnace and water heater.
I hope this helps.
One more thing... depending on the burners selected, the regulator you purchased may not be adequate.
BTW, my brewstands rock