Which version of Godot?
Here's an example of loading and instancing a scene (Godot 4):
# Load scene.
var Bullet: PackedScene = load("bullet.tscn")
# Create instance of scene. In this case, root node is an Area2D.
var bullet: Area2D = Bullet.instantiate()
# Adds scene to scene tree as child of current node.
add_child(bullet)
In Godot 3, use .instance() instead of .instantiate().
