a temp fix would be to bang the side of the carb with a screwdriver or ratchet handle. that will free up a stuck float long enough to get it home or to your destination.
once you get it there, remove the carb and pull the bowl off the bottom. then hose it out with some spray carb cleaner really good. the more you take off, the cleaner you can get it. be careful though. be sure you can remember how to put it all back together the right way.
a service manual helps more than anything when it comes to stuff like this and you can usually find them for free if you google it.