Before you launch your experiments, you need to populate your database with Experiment, Treatment, and Match objects.
Note
You do not need to create Match objects in advance. Match objects are created on the fly when participants visit the site. This allows pTree to randomize Matches to Treatments, regardless of the order in which participants visit the site.
In your app, under management/commands, open [app_name]_create_objects.py. and edit the function create_objects. In particular, you may want to customize the parameters of your Treatments, as well as the numbers of Treatments and Participants.
Then, whenever you launch your site (either for testing or the live version of the site), you will be able to create your objects by running the following command from your command line:
python manage.py [your_app_name]_create_objects
You can then browse the newly created objects in the pTree Experimenter Console, as explained in Experimenter console.