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on the gas valve is a knob...do you see the labels..PILOT...OFF...ON?
this means it is automatic ignition. There is no pilot to light.
Once the thermostat asks for heat it lights on its own. I am afraid with this type system we would need a voltmeter to see where and why we are missing power
Do you see a model on furnace above burners on inside panel?
Is there a control board on blower panel with an error light?
Take a quick look on the blower housing to see if there may be a resettable limit switch on the bottom of blower housing that will push in to reset.Often a dirty filter will cause the little button to pop out.
If you had one it should be on blower housing as in picture I sent.