Hi fillagirl. I'm not expert by any means, but here's what I'd do.

First of all, I don't think it's recommended anymore to wrap in burlap. Apparently it dries out the trees. Last year we had a tremendous amount of snow, and my Brandon cedars as well as my Junipers ended up with misshapen branches that had been weighed down all winter with too much snow. I'm going to loosely twine my trees this year to help prevent that.

If I had 12 new trees, I'd buy some t-posts and build an inexpensive burlap wall to protect from the wind and snow for the first year.

It's also very important at this time of year to make sure you've watered those trees really well.

Hope this helps. One of the tree experts here may have different or better advice for you =:)