I started an enemy

Scenes/enemy.tscn

@@ -0,0 +1,16 @@
+[gd_scene load_steps=3 format=3 uid="uid://b5lnjonlf4i1b"]
+
+[ext_resource type="Script" path="res://Scripts/Enemy.gd" id="1_xj62t"]
+
+[sub_resource type="ImageTexture" id="ImageTexture_s1wwp"]
+
+[node name="Enemy" type="Node2D"]
+script = ExtResource("1_xj62t")
+
+[node name="Sprite" type="Sprite2D" parent="."]
+texture = SubResource("ImageTexture_s1wwp")
+
+[node name="Atk_cooldown" type="Timer" parent="."]
+autostart = true
+
+[connection signal="timeout" from="Atk_cooldown" to="." method="_on_atk_cooldown_timeout"]

Scripts/Enemy.gd

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+extends Node2D
+
+
+# Called when the node enters the scene tree for the first time.
+func _ready():
+	pass # Replace with function body.
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta):
+	pass
+
+func _attack():
+	pass
+
+func _on_atk_cooldown_timeout():
+	pass # Replace with function body.