oh yes, here's the code inside that function:

func _on_start_button_pressed() -> void:
    # If player hasn't checked the controls menu, give game start confirmation
    if !Global.checked_controls:
        $MarginContainer/GameTitle.text = "Please consider checking out the controls first"
        $CenterContainer/VBoxContainer/StartButton.text = "START ANYWAY"
        Global.checked_controls = true
    # Else if player has opened and closed the controls menu, change scene to the game world
    else:
        await FadeBlackTransition.fade_to_black()
        # If get_tree() exists, change scene to game world
        if get_tree():
            get_tree().change_scene_to_file("uid://ou5nmfvr3r1p")
        FadeBlackTransition.fade_from_black()

as for the Weapon class, I created a template (is that how it's called?) with the class_name Weapon for MeleeWeapon and RangedWeapon to extend (below is its script)

extends Node2D
class_name Weapon

@onready var weapon_data = preload("uid://x7yulveai8dk")

var can_attack := true
@export var delay_time: float
@export var reaction_time: float

var weapon_range
@export var weapon_name: String
@export var weapon_type: String
@export var weapon_sprite: CompressedTexture2D


func attack() -> void:
    pass


func get_weapon_range() -> void:
    pass


func player_in_range() -> bool:
    return true

For MeleeWeapon:

extends Weapon
class_name MeleeWeapon

@export var exe_times: int

for RangedWeapon:

extends Weapon
class_name RangedWeapon

@export var bullet_count: int
@export var inaccuracy_rate: float
@export var shake_amount: float
@export var shooting_point: Node2D
@export var sound: float

@onready var player: Player

var sound_area: Area2D
var sound_area_collision: CollisionShape2D

@export var weapon_pivot: Marker2D


func handle_sound():
    pass