Launching SQL graphical interface

I am completely new to the SQL server. Recently, I have installed the MicroSoft’s trial version on my computer (PC, pentium-3, Windows 2000 ver).
Now, I want to get connected to Some existing Database, NorthWind using SQL server and would like to execute sqls.
I do not know how to get connected to sql server and execute the SQl scripts.
I appreciate you for your advice : how to launch the graphics interface to run sql statements.
Thanks,
Venu