This is an excellent video series for learning beginner French! Watch the episode above to learn how to say "thank you," and "you're welcome."
Merci = Thank you
Merci beaucoup = Thank you very much
De rien = You're welcome
Formal / Business
Je vous remercie = I thank you
Je vous en prie = You're quite welcome
Ingrid, the woman in the video, is French, so her accent is perfect. :) If you can imitate her, you're definitely on the right track! If you have any questions or vocabulary requests, be sure to let me know. Au revoir!