Hello my name is XXXXX XXXXX I will be more than happy to assist you.
Here are the instructions to replace the wiper motor system. Click on link below
WIPER MOTOR REPLACEMENT
No there is no certain position the wiper have to be in when you hook the wiper transmission up to the new wiper motor.
Your problem is either going to be the Switch or Wiper Motor Cover. There is one quick test you can do to find out which one it is. Click on link for instructions
Wiper Park Test