How to Utilize Gray Envelopes

So I just received the gray envelopes in the mail today and after reading what to do with them, I noticed there were far more than the four small stated ones and the one large one. Am I supposed to do each form separately except for the ones stated to be placed together?
I also noticed an empty line along the top left of the envelope. Is this where the subject/contents of the envelope are supposed to go?
Thanks for helping in advance.