Data Structure - Orders and multiple items

I am not sure of how or the best way to structure my data in models.py. I would like to have an order and allow multiple items / products to be added to an order. I know I can do a ManyToMany field but not sure how I would connect a qty to that. I am sure there is some simple way of doing this, or a better way to model the data. I know in many ERP systems they have an orders table and then an orders details table. Below is just a quick mock-up of how i was thinking on to do it until I started thinking about the many items and qty to an single order issue came up. Can any one give me some tips on how to accomplish this? 



class Item(models.Model): 
    name = models.CharField(max_length200) 
    description = models.TextField(blank=True) 

    def __unicode__(self): 
         return self.name 

class Customer 
    first_name = models.CharField(max_length=100) 
    last_name = models.CharField(max_length=100) 
    address = models.CharField(max_length=200) 

    def __unicode__(self): 
        return self.name 

class order(models.Model): 
    order = models.IntegerField(unique=True) 
    customer = models.ForeignKey('Customer') 

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