Start with the basics. Fuel air and spark. Remove the airfilter and spray some starting fluid in and see if it fires on that. If it does your not getting fuel. If it dosnt i would then go on to spark. Pull the plug and put it against the side of the engine and see if you have any spark. If you do then we get concerned. Cuz it probably has no compression(very bad news).
Welcome to the forums!
Welcome to the forums!