How would I go about making a bush? Would I make it in blender and import it into unity or is there an easier way?
As far as I know You need to make it in Blender export to Unity and place it in Unity’s special folders for nature environment.Here is some more info Unity documentation
There should be free ones in the engine itself included in the island demo. You find it in the assests folder under bushes, trees, etc. All you have to do is drag and drop. You can import it from other softwares.