Follow the arrow to the flat head screw on the bottom of the carb. Back that out until fuel flows out the spigot next to it. This is the chock side of the carb. Normally the yellow choke handle would be on this side.
As far as the "exrta" fluids, just change the oil (drain bolt near the shifter and under the oil tank), change the oil filter, clean the air filter and get rid of the gas. The 400ex engine is one of the toughest out there.