Starting an Internet Marketing Consulting Business - Suggestions for rates and ?

I'm starting an Internet Marketing consulting business and I'm wondering what to charge. What is the going rate for consulting? Is $75/hr too low?

Also, when you meet with someone to get started, how do you charge? I've already taken a look at his site and gave him some suggestions and a quick overview of the game plan. So, we're on to the next step. If I am also planning on developing a one page sales letter for his site, should I just incorporate that into the price and ask for 50% down, and then collect the other 50% upon completion?

Do you have a set number of hours that you meet with the client on a project, or do you not put a number on it and just keep track of the hours as you go? If you just keep track as you go, how to you come up with the amount of the 50% deposit?

Also, do you guys get a cut of the revenue, or increased revenue? If so, what percentage, how do you keep track, and how and how often do you collect?

I have a computer tech business and I'm used to getting paid on the spot and am not sure what the common protocol is for Internet Marketing.

TIA