To answer most of your problems, you people need to either use Turbo Tax or go to H&R Block. Each person will have a different result. If you are married and you file speratly, you both must match in how you itemize. If you do not itemize your taxes and you are married, you basically won't change how much you will get filing married filing jointly or filing seperatly.
And for the person that is getting married in November. It is not what your status is for most of the year, it is what your status is on December 31. If you happen to have a kid on December 31, yeap you get to take the deduction for the whole year. Works the same on your marriage status.