So I've decided after much debate and research to use symfony on my next project. To sum the project up, it is an LMS (Yes, I know there are pre-built ones such as moodle but they do not have what my particular company requires). There are many modules and issues to take into consideration. My question is in what order should one start with Symfony?
Note, the database is already made and populated with data.
The Doctrine ORM? User Authentication? Creating the Core modules? (Courses, Enrollment, Grades) Page security (i.e. installing the rules for who can access what page)?