Best Practices Django Questions

Hello, I'm in the design stages of a site that I'm building. It is going to be a basic social media site for a game I'm designing in unity. I'm not entirely sure how to do some of the things I want to in Django. Thus, my first question is generally best practices question as well as a how do I do this question.

Qustion #1: How do I set up my models field so that when a user uploads an image to a filefield it attaches the users name to the file that is being uploaded? Should I do this in the view or in the database?

Question #2: Examine my model design and tell me what I can do better, if I'm missing anything etc. I'm new to django so go easy. I didn't do the def and functions and class stuff just the over all structure. If it would be better if I posted that let me know and I will.

Question#3 How do I make the page when a user logs in resolve to his username, and how do I use the username as the url so when you click on a list of friends it uses that friends username as the url for their profile and resolves to thier page, a quick overview on the best way to do this would be just fine. Just point me and kinda explain the theory and I'm sure I can figure out the rest. 

Please just help me think of things I need to worry about design with django im just starting and I dont have a good base to go on.

User

id = models.AutoField(primary_key=True)

username = models.CharField(max_length=4000)

password = models.CharField(max_length=4000)

email = models.CharField(max_length=4000)

phone = models.CharField(max_length=4000)

profile_image = models.FileField()

about = models.CharField(max_length=4000)

hometown = models.CharField(max_length=4000)

job = models.CharField(max_length=4000)

score = models.CharField(max_length=4000)

hobbies = models.CharField(max_length=4000)

datetime = models.DateField()

Album

id = models.AutoField(primary_key=True)

userid = models.ForeignKey(User)

name = models.CharField(max_length=4000)

imageid = models.ForeignKey(Image)

datetime = models.DateField()

Image

id = models.AutoField(primary_key=True)

userid = models.ForeignKey(User)

image = models.FileField()

imgdesc = models.CharField(max_length=4000)

datetime = models.DateField()

Image_Comment

id = models.AutoField(primary_key=True)

userid = models.ForeignKey(User)

imageid = models.ForeignKey(Image)

comment = models.CharField(max_length=4000)

datetime = models.DateField()

Image_Likes

id = models.AutoField(primary_key=True)

imageid = models.ForeignKey(Image)

userid = models.ForeignKey(User)

datetime = models.DateField()

Post

id = models.AutoField(primary_key=True)

userid = models.ForeignKey(User)

message = models.CharField(max_length=4000)

image = models.FileField()

embed_link = models.CharField(max_length=4000)

liked_count = models.CharField(max_length=4000)

datetime = models.DateField()

Post_Comment

id = models.AutoField(primary_key=True)

userid = models.ForeignKey(User)

postid = models.ForeignKey(Post)

comment = models.CharField(max_length=4000)

datetime = models.DateField()

Post_User_Likes

id = models.AutoField(primary_key=True)

postid = models.ForeignKey(Post)

userid = models.ForeignKey(User)

datetime = models.DateField()

User_Friends

id = models.AutoField(primary_key=True)

userid = models.ForeignKey(User)

friendid = models.ForeignKey(User)

blocked = models.CharField(max_length=4000)

datetime = models.DateField()

Reported

id = models.AutoField(primary_key=True)

userid = models.ForeignKey(User)

friendid = models.ForeignKey(User)

comment = models.CharField(max_length=4000)

datetime = models.DateField()

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