Is there any meaning, which I am supposed to untangle, to things I saw during meditation?
In order to possibly determine the meaning of your thoughts, you would need to consult a psychoanalyst. What is important within the reference of a forum answering questions on Buddhism, is that these conceptual thoughts during meditation are to be pushed aside so that you return to your focal point, usually the breathe. The goal of meditation is not to allow your thoughts to jump from one to another while you sit on a cushion. The goal is the absence of thought, thereby generating a clear calm mind. This takes practice. As you are someone new to to Buddhism, I recommend that you not rely on your friend alone, but read and study, and attend as many teachings offered by genuine lamas in order to extend your knowledge. You have made a good start. The Buddha said to listen to what he had to say but explore the truth of it on one's own.