Don't present on your first customer visit, first discover your customer's/prospects needs.
Find out who your audience will be, and adjust your messaging accordingly (you will find out during the discovery).
- Keep it short
Use the Guy Kawasaki's 10-20-30 rule:
- 10 Slides
- 20 Minutes presentation
- 30 Minimum font size
That will leave you some time left for a discussion with your customer/prospect.
Being well prepared is half the work, rehearse on how to bring your content, but also how to handle objections.
- No handouts
You want your customers/prospects to listen and talk to you, not read your handouts.
- No dimmed lights
Don't dim the lights, your customers will lose focus on will not be paying attention to your and your message.