[Tkinter] Help with tkinter; images and button commands

[SheeppOSU]

I'm making a game and I have a few problems. The first is that the BG image shows up when the game is opened. I really just want it to open when the button is clicked. The second problem is the button is not triggering the command when it is pressed. It is supposed to delete everything and pull up button of the characters.
Here's the code

from tkinter import *

#Variables
tk = Tk()
ShotonButton = Button()
Shoton = Button()
Something = Button()
startbtn = Button()
CharacterVariable = 0
CharacterVariable2 = 0

#Images
ShotonImage = PhotoImage(file='C:/Users/Chadd/Pictures/Converted/Converted/Official Shoton.gif')
SomethingImage = PhotoImage(file='C:/Users/Chadd/Pictures/Converted/Character 1.gif')
BGImage = PhotoImage(file='C:/Users/Chadd/Downloads/Background.gif')

#Sprites
class Sprites():
    def Shoton():
        ShotonButton = Button(tk, text="", command=CharacterSelection(1), bg='red')
        Shoton = ShotonButton
        Shoton.config(image=ShotonImage, width=130, height=200 )
        Shoton.place(relx=.1, rely=.1)
        ShotonLabel = canvas.create_text(145, 310, text='Shoton', fill='red', font=('Times', 30))
    def Poop():
        Something = Button(tk, text="", command=CharacterSelection(2), bg='Brown')
        sg = Something
        sg.config(image=SomethingImage, width=130, height=200)
        sg.place(relx=.3, rely=.1)
        sgLabel = canvas.create_text(310, 310, text='PoopHead', fill='Brown', font=('Times', 25))

class Fighter():
        print('Finished')


#Canvas
class GameCanvas():
    def BackGround():
        canvas.create_image(0, 0, anchor=NW, image=BGImage)
    def CharSelInter():
        canvas.delete('all')
        startbtn.destroy()
        GameCanvas.BackGround()
        Sprites()

#Character Selection
class Char():
    def CharSel(character):
        Shoton.destroy()
        Something.destroy()
        canvas.delete('all')
        GameCanvas.BackGround()
        CharacterVariable = character
        findCharacter(0, character)

    def CharSel2(character):
        Shoton.destroy()
        Something.destroy()
        canvas.delete('all')
        GameCanvas.BackGround()
        Char.findChar(1, character)
        CharacterVariable2 = character

    def findChar(value, char):
        print(char)
        if value == 1:
            Fighter()
        else:
            CharSel2(character)
            Fighter()

#Start Screen
canvas = Canvas(tk, width=800, height=800, bg='blue')
canvas.pack()

startbtn = Button(tk, text="Start Game", command=GameCanvas.CharSelInter(), font=('Times', 50), bg='red', foreground='blue')
startbtn.pack()
startbtn.place(relx=.5, rely=.8, anchor="c")

GunnerText = canvas.create_text(400, 300, text='The Gunner', fill='red', font=('Times', 100))

Thanks in Advance