You need to install ENU\x64\SQLEXPRWT_x64_ENU.exe which is Express with Tools (RTM release. SP1 release can be found here).
As the page states
Express with Tools (with LocalDB) Includes the database engine and SQL
Server Management Studio Express) This package contains everything
needed to install and configure SQL Server as a database server.
Choose either LocalDB or Express depending on your needs above.
So install this and use the management studio included with it.