novice ... a beginner or a person who don't have any experience in a particular field.
I am a novice in a table tennis.
know the ropes ... to have enough experience about something
if you want to join a soccer club, you should know the ropes.
pinprick ... a very small cut
I had a pinprick after touching a bouquet of roses.
mentor ... a knowledgeable person, teacher
my mentor has always believed in my ability.
interrogate ... to ask someone a lot of questions for a long time in order to get information.