Here is a link to one of the forum's members "Norm" who did a good job explaning the workings and rebuild of carb used on the bike motors but will help with other carbs too. http://motorbicycling.com/f30/motori...build-302.html
If you pull the plug, the auto parts store can help you get the right one. Most times if you get fuel and spark, it will start. So like the others said, check the spark, and get the carb working. Good luck and welcome to the forum.