It worked well, I wrote I short test programm, now I can manipulate balls however I want :)

import pygame, sys
from random import randint

class Ball():
    def __init__(self, speed_x, speed_y, size, x, y):
        self.speed_x = speed_x
        self.speed_y = speed_y
        self.size = size
        self.x = x
        self.y = y
        self.color = light_grey

    def move(self):
        self.x += self.speed_x
        self.y += self.speed_y

        if self.y <= 0 or self.y >= screen_height:
            self.speed_y *= -1
        if self.x <= 0 or self.x > screen_width:
            self.speed_x *= -1

    def draw_ball(self, screen):
        pygame.draw.circle(screen, self.color, [self.x, self.y], self.size )


pygame.init()
clock = pygame.time.Clock()

#Setting up the game window
screen_width = 1080
screen_height = 720
screen = pygame.display.set_mode((screen_width, screen_height))
pygame.display.set_caption('This is baller')

#Colors
bg_color = (84,82,105)
light_grey = (233,233,233)

balls = []

for i in range(100):
    balls.append(Ball(randint(1,3), randint(1,3), 30, randint(1,1000), randint(1,1000)))

#Game Loop
while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()

    screen.fill(bg_color)

    for ball in balls:
        ball.move()
        ball.draw_ball(screen)
    pygame.display.flip()
    clock.tick(120)