I finally took some pictures as I was making a tree out of brown paper and wire. I'll write a brief tutorial.
I generally post similar information (sometimes with more information) on my blog - https://withglueandglitter.blogspot.com/2017/07/spooky-tree-tutorial.html
in case you want to look there.
1. All the supplies you need except for glue. First cut some wire in about 3-4 different lengths - a few long ones for the trunk - 6 or so, some medium ones for branches and smaller ones to use for branches and roots.
2. Tear strips of paper to wrap around the wire. Usually I make the paper shorter than the wire so the ends of the wire stick out. That way I know that wire extends all the way through the branch. Fatter strips make fatter branches or trunks. You can always add more later so they don't need to be very fat at this point.
3. Roll the paper around the wire. I don't usually need glue for these shorter branches, but I do use it on the longer branches.