Does anyboudy knows how I can make a script in Filemaker which opens Word
and import a few fields from Filemaker to Word?

To open a word doc, use the "open url" script step. Pass it the
filename of the document you want to open. I don't believe you can
"push" data from FileMaker to Word. Instead, you'll have to set up a
mail merge in Word which "pulls" data from FileMaker.