Here is a quick tutorial on making trees.
Copper wire cut to required size and bent into U shape.
Cut rope to required sizes and flare. Insert it into copper wire.
Insert wire into variable drill, clamp bottom with pliers and start drill.
Your tree should look something like this now.
Trim tree to required shape and size.
Spray stem brown.
It should look as follows.
When dry spray on adhesive.
Flock with foam folliage flock.
Here are a few final products.
Hope this has helped.
Remember no two trees are alike.