This is a very simple circuit and based on your description it sounds like a bad blower motor. However in order to make 100% certainty of this you need to purchase either a inexpensive voltmeter or a generic 12 V test light. The blower motor is located on the passenger side up under where the passengers feet would go. There is a two wire connector at this two wire connector you need to check for voltage with the blower switch in the on position check for 12 V to the blue wire with a red tracer. It should have 12 V then check the blue wire with a black tracer do you have 12 V there? If you do not and the blower motor is not spinning then the blower motor is bad. Take a mallet and bang on the round portion of the blower motor and see if you can get it to start working. Or before you even buy a test light take a rubber mallet and bang on the blower motor and see if you will start to work if it does then that confirms it without spending any money on a test light.