Clickety ... http://www.skillendar.com

I speak from zero experience of selling, but a great deal of experience of public speaking ...

What really, really matters is seeing something interesting early. Really early. First 3 seconds maximum. And not generically interesting - interesting specifically to a person who will give you money.

If they won't give you money, you don't care.

So who will give you money? Figure out who they are, and make sure they see something they want within 3 seconds.

Beter yet - 1 second. Hard to achieve. Be creative.