1. Respect each other's schedule (class or work)
2. Don't talk on the phone in the room when your roommate is sleeping
3. Clean up after yourself, especially in the common areas
4. Respect your roommate's space and things
5. If you're going to borrow something, make sure to ask their permission!
6. Deal with problems quickly instead of letting it build up
7. Be respectful when inviting guests over
8. Respect each other's quiet time
All-in-all, it's really important to establish some basic rules before starting your roommate journey. It will only help you moving ahead and know the dos & dont's!