I have an out of control parcel of land which is full of weed, shrubs,
even small trees. It has been like this for about 10 years now, so
various animals currently inhabit the land (groundhogs, rabbits, etc.)
What's the best means of cleaning up this parcel? Of course, I want
to convert this untamed piece of land to a lawn full of green grass.

I was told that the best means of doing so would be to buy heavy,
thick black plastic covers, so that no sunlight will penetrate. I was
also told, however, that it's too late in the season to do so (I live
in New Jersey which has four full seasons).

Is this right? If so, is there anything I can do between now and the
next summer? Do weed killers work in fall or winter?

How would you go about taming a piece of property like this?