You created your own server, and now you would like to move all of your apps on heroku to your custom server, right?
If so, first thing to do is to move your database from heroku to new server.
These are the steps to do so:
Make DB backup on heroku
heroku pg:backups:capture --app sushi
Download your database
Upload your download dump to server via SSH
scp -P 22 latest.dump [email protected]:~/
Then import latest dump into your newly created database
pg_restore --verbose --clean --no-acl --no-owner -h localhost -U ubuntu -d opend_production ~/latest.dump