Neccessary procedure for deploying a django app for production

I have developed a django app and i'am confused.

1). What is the procedure to convert the django app from development to production.

2). Once the app is available for users (ie Live on a server),How to add future development to the app without needing to upload the whole thing but just the changes and the new packages.

3)Is sqllite efficient enough to be used for servicing a large group of users and integration with android, ios apps.