Welcome to the forums @Wolfprint 
To make character sit in the place you want, you need to use spot directing.
Place your character in default first, but with the sit animation and facing the right way.
So for example:
@CHARACTER stands screen right AND CHARACTER faces right AND CHARACTER is sit
then you need to use
Directing Helper -> Spot Helper
Check out this thread here 
Make character smaller/bigger and move to the place you want then just copy the numbers to your script.