If the plugs are sparking then it is a fuel issue , have you tried to push start it ? Get some carb spay ( quick start ) and spray it into the carbs with the throttle open .
If it fires up and dies aferwards you can be sure it is a fuel issue . Get an airbox or some pod filters to stop dirt getting into your motor .
If there is no spark when you kick it over then you need to check the main fuses and the kill switch . Hold the plugs in your hands while your friend kicks the bike - you will find out if they are working or not !