Most important thing about making any speech is to prepare it and practice it or run through it a few times. If you see anyone who makes a speech that flows well and looks like he/she was speaking from the heart, you can be sure that it wasn't ad-libbed, it was prepared.
Get a few small index cards and write the main points on them, they fit in an inside pocket and you don't have to unfold sheets of paper. A good tip that I learned a long time ago is to punch a hole in the corner of each card and thread one of those green document tags (the short string with two metal T-ends on it) through the holes to avoid dropping a card.
If you prepare properly and more or less learn off the speech, the headings on the cards will prompt you through it without looking as if you are reading it. And of course, don't forget anyone -- less likely if it's written down, quite likely otherwise.