A few days ago I had really strange dreams and now I would really like to know what did they mean, because I am thinking about them all the time.

It started just after my death. I didn't see how did I die or when. It just started me being an angel. I was able to fly through walls, closed doors and windows, through anything. I wasn't alone. There were a few other angels. One of them was my best friend. We flew to a big house (like a big factory). Then we stopped there and chat with others. The "boss" of the angels told us that they want two of us for something to do. They choose me and my friend. We had to walk in small room. It was like we would be at the doctor. They checked our abbilities and then they said we are ready. That is where anything ended. I woke up.
Please help me to understand, because I don't.

Rooms very often represent different parts of your personality or subconscious, it's a very common motif in dreams because we do nearly everything in rooms of one sort or another in our daily waking lives. So big rooms, like in a factory or warehouse, could represent your bigger thoughts and feelings, or higher spiritual thoughts such as death and angels. It could be that your brain is wanting to connect with 'higher' thoughts while you sleep, the bigger questions we all have about life and death, and perhaps even an afterlife?

This dream also feels to me like being trapped between two worlds or schools of thought. I've had similiar dreams when I was unemployed or in a transition from school to job seeking.

The part about being in a factory and the boss checking for abilities feels like the earthbound part. The flying like angels is the part of the self looking for something more, like a nobel cause or higher education.