the tour director helps with information
Depends on what you mean. There really aren't any countries competing, that's all done by professional teams that only represent themselves and are composed of people from all over the place. The...
You cannot enter the Tour de France; the UCI and ASO invite ProTour/UCI sanctioned teams to compete.
multi stage race across a mountain range stretching over several days
The next race is in 2011 (this year)
every year it has ended in Paris..... so that's were its ending this year!