A frontside 180 is one of the first freestyle tricks most snowboarders learn. In a Flat Ground 180, you don't use any kicker and just do it on the slope. Your chest rotates toward the downhill side during the takeoff. You land riding switch, so the trick only really clicks once switch riding feels at least passable.
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Step 1 - setup: Ride in on a gentle heel-side edge with closed shoulders
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Step 2 - pop and rotate: as you're popping (the same ollie pop you already know) turn your head and shoulders forward creating the frontside rotation then bring the board around with the momentum.
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Step 3 - land: land on the toe-side edge. Remember to keep looking forward and ride it out
Video lesson here:
Video by Snowboard Addiction