Printers usually print the first page first, and the last page last, so the pages end up in reverse order when you pick them up. If needed, you can reverse this printing order.

If you are printing more than one copy of the document, the print-outs will be grouped by page number by default (that is, all of the copies of page one come out, then the copies of page two, and so on). Collating will make each copy come out with its pages grouped together in the right order instead.