My lawnmore is spitting out white smoke and oil is black?

Hey its Peter Baxter her I have a Sovereign Petrol Push Rotary Mower - 149.3cc and its not working It will not start and if it dis there is white smoke poring out and then it cuts out also were the oil goes I check it and the oil has gone black and It is also leaking black fluid from somewhere and that's it I hope. Thanks