Numerous organisations offer professional training and support ... to get you started and to constantly improve your performance.

This short list of web site links may provide you with a contact point in your local area to assist you.

Toastmasters International
www.toastmasters.org

Dale Carnegie
www.dalecarnegie.com

National Speakers Association
www.nsaspeaker.org

Other:
www.effectivespeaker.co.nz
www.publicspeakingtraining.net
wwwpublicspeakingskills.com
www.skillstudio.co.uk
www.mediatrainingworldwide.com

I have not attended this training personally, although I have some knowledge of Toastmasters, National Speakers Association and Dale Carnegie.

Before booking yourself onto any of these courses or signing as a member, go along for a no obligation introductory visit, talk with three independent people who can give you their feedback (the organisation would be glad to give you referees to talk with), then ask the referees for a name of someone else who went and send them an email also.