pony123lucy,
I too am new. Here is my suggestion.
They are usually very loud inside, upon entering, count the number in line, the number of occupied tables...
You can use your phone as a recording device, (or audio recorder) most people now a days carry a cell in their hands...record the descriptions of each line crew. Be aware of your greeting...who, what was said...Observe each pan of food, was it full, how did it look, dry, juicy, so on....
Seat yourself in a position where you can observe the line. Record the description of each crew member, also keep track of table visits, what was said, were hands washer, what was chef doing, so on...???? if there was anyone cleaning the dining room. Remember to visit the restroom, count the number of occupied tables and number in line when you depart...
Good luck! It does become easier.