Task: Expand the bit to full form, five to ten minutes.

Disclaimer: This is my approach, adapt it as your like.

Note: I develop these individually, then connect them.

Opening: Usually a minute or two to set the stage, letting the audience to decide whether it's worth hearing.

Middle: This is a two stage process. First, I separate the middle into key points, then create a hundred words or so for each. Next, I connect them into the whole middle.

Closing: Two minutes seems about right here, with the final line, the sign off being a memorable/quoteable sentence.

Finally: Connect these three into a core bit of four to six minutes. This is your message, but it may be a bit bland.