How to host an offline internet marketing workshop for big money?

I have seen people holding internet marketing seminars for over $500 per person per day. It seems that there is a lot of money to be made for people who can do this.

My main profession is a teacher, so I have a lot of experience in teaching people and I have been an internet marketer for more than 3 years. I think I have what it takes to present some useful seminars or workshops for people who are interested in internet marketing. I would book a room with computers so that I can help the clients personally with hands on experience.

I would probably use locally targeted PPC and offline ads to advertise a seminar/workshop like this and start small. (10-20 people) and focus on one particular aspect of internet marketing, like setting up a sales funnel, affiliate marketing, micro niche blogging, seo etc. And charge small fees ($50/person?) until I build up a good repitation and scale it up a bit, maybe even getting other internet marketers in.

My question:

I have no experience in this. How would one go about in doing this? Are there anyone here who is currently doing something like this or who can give some advice on where to get started?

I will be relocating to my home country, South Africa, end of this year and am thinking about doing something like this. Internet marketing is still a bit new there, so I think that there will be a good market for something like that.

Thanks for all the input and advice,
Bertus