You don't really need to do anything. If you want, however, you can pour fuel down a carb vent tube to fill the bowl prior to cranking it over. Watch the level through the bowl window as you add the fuel and just fill it to the middle mark. The engine will run for a few minutes with a bowl-full.
And don't just dump it down the carb throat; try to pour it just down the vent tube (I'd hate to hear about your truck and/or garage burning to the ground.) I just fold a spout into small tin can to add fuel this way.
Be safe.
Todd Bull.