Upvote:0
You need to enter from the country that you obtained your visa first. After that you are free to go anywhere you want. You can fly back to your country from any schengen country as well.
Upvote:2
Yes. You will only be entering Schengen once. When you enter Poland, you are entering the Schengen Area; when you then fly to France, you are moving within the Schengen Area.