There are two ways to say I HAVE SMTH in Turkish. First one shows smth that you have with you in a present moment, right now (Sende bir kalem var mı? - Do you have a pan?), the second is to express what you own in general (Senin kızın var mi?- Do you have a daughter?). So answering your question: VAR meaning to have, requires particular suffexes. BenDE or BenIM. When it means there are, there will normally be a place indicated (Otoparkta beş araba var- There are five cars in the parking lot) plus the word VAR/YOK in the end or just the word VAR/YOK after the subject (Boş oda var. There are vacant rooms).
Im not a native speaker, but this is what i got from the previous lessons. So if i am not right please feel free to add or adjust.