Django - Am I in the right direction for creating the models of my Phone Review appli

[shawnmichaels583583]

I am a beginner in Django. I am building a data model for a Django app, named PhoneReview. It will store reviews related to the latest mobile phone. It's table should include:
a. Brand – details on brand, such as, name, origin, manufacturing since, etc

b. Model – details on model, such as, model name, launch date, platform, etc

c. Review – review article on the mobile phone and date published, etc

d. Many-to-many relationship between Review and Model.

Here are my codes in models.py:

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from django.db import models from django.template.defaultfilters import slugify   # Create your models here. class Brand(models.Model):     brandName = models.CharField(max_length=100)     origin = models.CharField(max_length=100)     manufacturingSince = models.CharField(max_length=50, default='null')     def __str__(self):         return self.brandName   class PhoneModel(models.Model):     modelName = models.CharField(max_length=100)     launchDate = models.CharField(max_length=100)     platform = models.CharField(max_length=100)     def __str__(self):         return self.modelName   class Review(models.Model):     model_name_many_to_many = models.ManyToManyField(PhoneModel)     reviewArticle = models.CharField(max_length=1000)     datePublished = models.DateField(auto_now=True)     slug = models.SlugField(max_length=150, default='null')     def __str__(self):         return self.reviewArticle

Are my codes correct? Am I in the right direction?