Yea #1 always make sure that you see fuel delivered to your carb. You can stuff the exhaust with a finger and pull on the pull start untill you see a stream of fuel going in the carb.
Set the carb at the factory setting. It'll be hard to start because it's pretty rich. Chances are you are flooding the engine. So once the fuel is delivered into the carb....try opening the carb (w/o the filter) all the way and then pull on the pull start - you'll see fuel spraying out. Then try to start the engine.
OR you can try to pinch the fuel like just a bit....while starting the engine. This is kinda hard on a pull start.
Lastly, you can always try to loosen the plug a little - and once the engine starts - tighen it back.
It's tricky the first couple of times - but once you get it going it should be fine.