Here's a tutorial on how to get started building a web application with Django. Comment below or over at codementor if you have any questions and I'll see if I can help :)
This tutorial appears to be out of date now. When you try to run the default django template from repl.it it gives an error "bash: ./manage.py: No such file or directory"
It appears that you need to create a manage.py file in your repl.it and assign it the appropriate permissions before beginning this tutorial.