NO...
Yes, if followed by a comma.
Yes, if it is the first word of the sentence.
Using commas with introductory adverbs is a stylistic consideration. Using a comma in this situation is never incorrect, but many writers have recently started omitting the comma. You could also try moving the adverb around in the sentence, expunging this problem completely: instead of saying "Suddenly, the filled cup fell off the table," you could write "The filled cup suddenly fell off the table," or "The filled cup fell off the table suddenly."
No. After the word and comma can not be used, as it is grammatically inappropriate to use comma after conjunctions such as and, which are called coordinate conjunctions.
No, a comma is not necessary.
no
no
You can use a comma after an opener , so if it is 'Finally' the opener you are talking about, then yes.
In a company name such as "ABC Corp," do not use a comma. However, use a comma in the formulation, "ABC, Inc."
You can use ", and" or just "and" but not just a comma.
The use of a comma does not depend on the word, it depends on the sentence structure. At times a comma will follow 'which' and at other times it will not.
Example: It was hot, humid, and raining. In the example above, the comma after "humid" is unnecessary but acceptable. The use of the comma before 'and' is called the 'serial comma' or the 'Oxford comma', it's optional. Many people use the serial comma for clarity. The other use of a comma is to break up a long sentence, and signifies a slight pause. Example: He hit the ball, dropped the bat, and ran to first base.