These sites explain how to prune and train young fruit trees.
One other note.* In order to have a dwarf tree, you would need to graft it on a dwarf rootstock.* You can't make a standard sized tree a dwarf by pruning.* I'm sure you won't be interested in joining this group, but some of the info that is here should be helpfful to you.
I hope that helps,
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.