wonderful lesson! there was a lot of useful words in this particular lesson that helps with conversation. Keep up the Good work!
Shukran!!!!!!!!!

you can use من فضلك for please, right?

Yes, you can use من فضللك for please
We used it in the Arabic Coffee lower intermediate lesson

txx for the lesson and i have a question. In turkish we use the word müşteri(mushtery) for customer which comes from arabic, with arabic letters it should be written as مشتري which means the person who buys, i think. I wonder is it used in arabic as well?

It is used exactly as you described. The person who buys (buyer) is called (mushtari مشتري) in Arabic. I believe the letter (ş in Turkish sounds like (sh).

yeah it sounds like sh.. so can i use مشتري as well as زبون for customer? is it common?

Well, زبون is used to describe someone who comes often فo buy things, so it is better to use it for customer.
مشتري is really used when someone buys something from you only once, for instance someone buys your car, so you tell me (This is the buyer of my car هذا هو مشتري سيّارتي)