I know Polish pronunciation is not easy.  For a couple of years I’ve been teaching I noticed how different problems with it you have. I describe Polish sounds during two first classes. I demonstrate the sounds and I show you the shape your mouth should take when pronounces “sz”, “Å›”, “s” etc.  If you don’t have classes or language partner, read the file below. I explained Polish sounds the best I can. You will find some exercises  here and a basic dialogue. I believe it’s a good way to start your adventure with Polish! Enjoy!
A1, Polish pronunciation in English for Beginners