on the deck between the console and the seat are two skinny rods. one is a parking brake, the other releases the transmission so you can move the mower.
as far as cranking the engine, take off the whole front shroud and locate the starter motor. there's one large copper stud. take your jumper cables and use an automotive battery in good charged condition. negative goes to batt and mower chassis. positive goes to batt pos - now touch the other pos end to that large stud on the starter. if its any good it will turn over the engine.
chances are because the mower was left outside, the ignition switch is bad. I had to replace mine a year ago. the mower was always stored outside.
to start the engine, pull out the choke handle all the way out. throttle should be at high speed. when you start the engine it will run but start to sputter, push in the choke handle and it should even out.