TIP1:Speak clearly and fluently to make it easy for listeners to understand.
TIP2:If you make a little mistake keep going and they wont even relise you made a mistake.
TIP3:Make sure to say words that are easy to understand because not all listeners will know a lot about the subject.
TIP4:Act as if your not reading a script.

TIP5:Make every effort to minimize background noise, at the very least use software that will allow you to edit out extra noises that occur while recording.
TIP6:Practice until as good as possible then record.