No, because the ampersand is not to be used in place of and. The basic rule for the ampersand is Don't use it, except in brands and trade names only, like Smith&Wesson or AT&T. Use and.
before
No, a comma is not necessary.
no
You would use a comma before it. Xerox, Inc.
if the main or most important part is before the main parts you use a comma, but if it is after then no comma
Yes, you can put a comma before except. Example of a comma before except in a sentence- She can do it, except that the mountain is too steep
no
No
no
You do not use a comma before III, or before any Roman Numeral, if it is part of a name such as King George III.
I do not use a comma before and after that word, therefore you will not see it in any sentence I have written.
Use a comma before a parenthesis when the information within the parentheses is not necessary for the sentence to make sense. Use a comma after a parenthesis when the information inside the parentheses is necessary for the sentence to be understood.