This is what you need. Your colors may differ.
First you take a baseplate and put these bricks on it ...
... and put some flat pieces on it. The 2x6 blue brick
is not a flat one.
... and three more bricks of standard height.
Now you need these parts ...
... to build up this ...
... and put four more flat pieces on it ...
... and two more flat pieces and one 1x4 brick of standard
height.
For the gearing you need now these parts ...
... to be assembled ...
... and to be put on here.
For the switch you need these parts ...
... to be assembled like this ...
... to be further assembled like this ...
... and to be put on here.
With these last parts ...
... you reach the end.
Have a lot of fun.