2. Instead of saying "the indoor soccer" I would just say "for indoor soccer".

3. I would say that yes, generally these all mean the same thing. However, just in my opinion, I think that dying/desperate are more dramatic, so if you REALLY wanted to do something, then I would use those.

4. Yes, I would describe a plain girl that way.

5. Yes, that is something you could say. I know a lot of people use the phrase, "You can, but you won't." It's basically what you said, just in fewer words.

6. Essentially these are the same thing. Relaxed can be both temporary and a way to describe a personality. Also, it would be "he does everything in a laid back/relaxed/care-free manner" because they're adjectives.

7. We do say cut loose, yes.

8. Scenario can mean situation. For example, "Best case scenario would be that this answer helps you. Worst case scenario is that nothing I say makes sense."

9. You could say that. Or you could simply say "This club is less crowded than the other club."

10. Busted tends to suggest that something can't be fixed, or that there isn't a quick fix for it. Broken can also suggest this. Damaged suggests that it can be fixed.

11. That makes sense.

12. I would say something more along the lines of "I joined the club last month, but no one has contacted me since then."