Outside Storage. Help!!!

I hope for the cars sake it's not parked on grass/ground/leaves. get a car cover/tarp on it and get it on solid ground.

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My 1988 has spent every winter in storage since way back when I bought it in March of that year. These days I invest in heated storage (my Ducati has since claimed my garage), but early on (I was 18 and a poor college student) I had to leave it outside like you, but never over porous earth. Instead I bought a huge blue plastic tarp and laid that down with a 4x4 beam in the middle. The idea there was to put a 'roof peak' in the tarp to encourage any snow/water that collected under the car to drain off to the sides and not puddle up under the car. It also was sort of a vapor barrier against moisture coming up through the ground during thaws, etc.

Make sure to shovel around the car to encourage air flow. When it's not snowing, cold winter air is very dry so not an issue with that. Change the oil and filter. Overinflate the tires. Fogg the cylinders. Lubricate all moving parts. Wax the car if you can. Put a can of Dry-Out or similar desiccant (Home Depot) on the center console and roll up the windows and close the heat vents. Put a knot of steel wool in the tail pipes to keep the mice out. Put a bag of moth balls under the hood to keep the mice out. Cover the car with a soft cover, then over that layer another plastic sheet, arranged so snow/rain rolls off and doesn't soak the cover underneath.