It is vital you manage the pace of your delivery and to make it as conversational as you can if you're reading it off a script.  Learn some old school broadcasting tricks to help you do both of these things.
If you need a stopwatch to time your speech, www.free-stopwatch.com is a great basic option.
To set your font and margins make your typing area 4-3/4" wide (simply drag the margin arrows at the top of your word processor program,) and set your font to Arial 11-pt.
To change fonts and size, just type a few lines in the settings I gave you.  Then, open a new typing window.  Copy-'n-paste the text from the first window and change the font and size to your liking. Then adjust the width of the margin until the text in the new window lines up like the text in the first window. Note these settings and save them for future use.
Thanks for listening!