jackcav20:
I probably couldn't connect motors to the circuit until I get another external voltage source correct? Thanks.
depending on the module you get, you may be able to connect the external source TO IT - and then it will have a power out (5V) for the Arduino supply.
the L293 was also my first H-bridge, bear in mind it has a 1A limit - that caused me problems with the motors i did have - i ended going for a module with the L298 - you can get them quite cheap (stand-alone modules, as opposed to shields that plug on to the Uno)