Find a Random Coord, place a chest there with loot

[ThatBraxGuy]

Hello! I'm trying to write a skript that finds a random coord on the surface, places a chest there with some customizable loot, strike lightning there, point players compasses toward it, and place a few mobs around the chest to "guard" it.

This is what I have so far, but I'm not sure that it will work

every 2 minutes:
    if {dutchman} is true:
        chance of 8%:
            set {_lootloc} to the location at (random integer between -1250 and 1250), 255, (random integer between -1250 and 1250)
            while block below y-coordinate of {_lootloc} is air:
                subract 1 from y-coordinate of {_lootloc}
            broadcast "&lThe Dutchman has appeared at %{_lootloc}%!"
            broadcast "&cWhat is it you most desire? The compass points you there."
            loop all players:
                set the loop-player's compass target to location of {_lootloc}

Will this work? What can I do to fix it? Still getting back into skript. Any help appreciated.