Documents are to be printed on (minimum) 20# white paper and printed true to size. In other words, (as an example) you’ll receive a PDF comprised of 140 pages. One page will be 8.5x11 and the next page may be 8.5x14, then those 2 pages are to be printed in those sizes (letter and legal, respectively). You’ll find most packages are of mixed sizes so it really helps to have a dual tray printer. One more thing: printer should be a laser printer, not ink.
Now I have a question for you. Did you have any training prior to setting out on this quest? If so, who trained you?