Lawn Mower Will Not Start And Spoke Comes Out Of Exhaust?

Problem recently let go after the lawnmower a few days, it will not start. I pull the start of the chain and more, and it will not start.
  Also after I mess with it, it starts, but a lot of smoke out of exchaust. You do not know why or what to do to solve this problem.
  I have a toro lawn mower if that helps.
  Thank you!