SQL Server 2008 - Table - Clarifications

Hi,
I am new to SQL Server 2008 database development.

Here I have a master table named 'Student' and a child table named 'Address'. The common column between these tables is 'Student ID'.

My doubts are:

> Do we need to put 'Address Id' in the 'Address' table and make it primary key? Is it mandatory?
( I won't be suing this 'Address Id' in any of my reports )

> Is Primary key column a must in any table?

Would you please help me on these.

Would you please also refer best links/tutorials for SQL Server 2008 database design practices (If you are aware of) which includes naming conventions, best practices, SQL optimizations etc. etc.

Thank you,
Regards.
Aarti.