Doubts about laser on the face. How many sessions are needed?

I have some fears about do laser in my face. I want to remove the hair of my upper lip, chin and eyebrows but I am a really hairy person. I use to wax my upper lip 3 times per week and I am afraid that if I have to shave that area, 2 days after the session my hair will grow up again but darker and stronger and that can be worst. What do you recommend me? How many sessions it use to be needed to remove the hair completely in that areas? What kind of laser is the best for the face area? Thank you!