Hello, here are the samples from a book which I used with my student last year polskikrokpokroku.pl/sample_polish_lessons.html there is also a link to online polish course, but I think you can use only demo versions of the lessons for free. Best regards and be patient with your Polish :)
Regrettably most of the books aren't the best resources for not advanced learners of the Polish language. This is not a contemporary language. Yet, maybe you will choose something for yourself.
If I can recommend you something, try to start with polish translations of Hans Christian Andersen' fairy tales - [ wolnelektury.pl/katalog/autor/hans-christian-andersen/ ] some of them have it's audio version on [ czytamysluchajac.pl/andersen ], what in my
opinion is very helpful, when one learns foreign language.
You can also try 'Latarnik' by H.Sienkiewicz - [ wolnelektury.pl/katalog/lektura/latarnik/ ] - the book has its audio version too.
Good luck!
ps: I'm sorry, but I'm new here and because of that, the spamm filter didn't let me add proper links to the webpages, for your convenience I put the links into square brackets.