Hello again airbus02,
Again, I applaud you for your enthusiasm. I did not suggest you did anything wrong at all, in fact, quite the opposite. What I am attempting to do is to encourage you to spend some time reading through these forums. It is from this that you will gain a wealth of knowledge. Then with this knowledge, your understanding of the industry will increase and as a result, your questions will become more focused, as opposed to the appearance of random thoughts.
That said, salaries vary greatly between airlines and seniority. Read through the Terms of Endearment and Wannabes. A lot of good information there. As for the hotel rooms, yes, for the most part, you don't need to share a room, unless it's the Crew Room and there's only one couch.
Enjoy reading and keep your interest. This is a fascinating industry. Take some time to learn about it from those here who have already experienced it.
All the best.
11Fan