boatingbill gave you a great list. Here is one more item - look very closely at the gas in the tank. Preferably, attempt to drain the tank by removing the rubber flex hose that connects the tank to the metal fuel line. That gas may have evaporated down to an evil gummy stinking mess, and you don't want that in your carb.
If the gas drains out freely, get all that you can out. Unhook the connection between the metal fuel line and fuel pump, and blow the line out with compressed air. (Might also be a good time to check the metal line for leaks by using a hand-held vacuum pump [Mighty-vac] to pull a vacuum on the line; if it holds vacuum you should be good. If you can't pull a vacuum on the line or if the vacuum leaks down quickly, you have a leak somewhere in the line.) Hook everything back up, and put some fresh gas in the tank.
If the gas doesn't drain out freely, consider cleaning the tank out.
Good luck, and keep us posted on progress!