first thing you have to NOT do is start the engine untill you have changed or repaired damaged casing as running bike with no oil will wreck it.drain whatoil is left in the engine and remove and replace casing new gasket refill with oil.remove spark plugs as the cylinders might be full of petrol and then try and turn engine over with plugs out do it by hand if you can rather than starter motor incase it is full of petrol dont want plug sparking just as it chucks fuel out of plug hole.indicators and lights not working check usual things like bulbs as the shock could ofblown them and as bullet said flas rate will return to normall once you have both front and rear bulbs working again