You really do need that Owners Manual as RickB said. That will not only show the schedule, it will also show you where the lube points are located for greasing your tractor. The draining of fluids is a little tricky. The engine has two drain plugs that are obvious. The transmission also has two plugs. We could be weeks trying to describe all these locations. You really need that manual.
As far as the schedule goes, I think if you lift the hood and look on the bottom side, you will see a maintenance schedule unless it has been removed.