First off, the Workbench pretty much has the command line. After you start the Workbench application and double click whatever DBMS you want to use, you get a new tab representing this DBMS. There is one tab open inside this DBMS' tab called Query1 which is equivalent to the command line, except I find it superior since it acts like a simple code editor as well.
Thus, where it says Query1, you can issue any SQL statement you want to:
USE dbname;
CREATE TABLE ... (...);
SELECT stuff FROM sometable;
etc...
Also note that as lone as you end each statement with a ; (required by SQL syntax to end a statement and also required when using the CLI, while not required in Workbench), you can have several statements in the same Query window and select which one you want to execute by moving the cursor to that statement. Cmd-enter executes the statement on OSX, so I'd guess ctrl-enter would do it on windows.
If you really want to use the CLI, just open a terminal window and use "mysql -u username -p" to be able to log in. If the DBMS is on another machine, you can use mysql client to connect to it directly, assuming mysql server is configured to allow your user to connect from whatever IP address you have. Otherwise you can always SSH to the server first and then run mysql client from there.
