Hi Froggy,
firstly, whats your hourly rate? £25 per hour - ish for an hour's talk. Perhaps offer a discount if they book you for 2 hours.
to do with the talk:
Introduce yourself, who are you, what you are qualfied in, where you can be found (but keep it brief and don't seem as if you are doing the big sell)
firstly I talk about the history and development of IHM to include the culture, ie baby massage, family sessions, male grooming, female grooming, how it came to the IHM.
secondly, what the massage consists of ie upper back, shoulders, etc, etc.
thirdly, benefits and contra-indications.
fourthly, preparation, ie creating an ambience, peace and quiet, have oil if using, wash hands, play music.
fifthly, a demo or get the audience into pairs and get them to copy you.
sixly, Q & A
seventhly, where you can be found, ie here's my business card, I am available, etc.