Go to https://circleci.com/add-projects and follow the project
This should tigger your first build
Before you can configure CircleCI to deploy to Heroku you must Setup an API key on Heroku
https://devcenter.heroku.com/articles/authentication
Then in Circle CI
- Add that API key to CircleCI
- Associate a Heroku SSH key with your account
https://circleci.com/docs/continuous-deployment-with-heroku
After that edit (or create) the circle.yml file and add deployment instructions