To obtain ignition you need 3 things
Fuel, Air and Spark
Air you got
Spark you can observe (And likely have but observe it,, if it is not sparking you need a new control board)
FUEL however..DO YOU HAVE GAS (I assume you checked the tank and main vlave)
For gas to flow, assuming you have Propane and the main valve is option, and if you have an xplosive gas (propane) detector it is turned on (IF it has a switch) or to make it easier the furnace and stove top and water heater (on gas) all work. Then you have the gas solenoid and the burner orifice.
There is a spider that likes to nest in the oriface.