You have a great product, like your ebook in your hand. Or you are an affiliate for some other ebook. Without advertising nobody knows about your product. You should start your advertising campaign as soon as you upload your product details to your website.

Before starting advertising you should develop a marketing plan for your ebook.

You should clear few criteria yourself before actually starting advertising.

1. What you are going to sell?

Develop a short description of your ebook. You want to include the benefits of buying the ebook from you. Benefits should include how your product or service can improve or help your potential customers.

Write them in short lines and paragraphs with clear space in between.

2. Who are your target audience?

Next determine who your potential customers are. You are selling your ebook now. What is the subject of your ebook?

Is it childrens fiction story book? Then your target audience would be children.

If it is about 'how to have a good retirement plan' your target audience would be mem and women over 40.

3. Where are you going to advertise?

Write down a list of advertising resources like search engines, PPC Engines, ezines, Newsletters, Opt-in lists, banner exchanges etc.

Like the above example, if you are selling childrens story book then you have to concentrate a little bit more in advertising in childrens sites like banner exchanges with them or keeping your ebook details in local childrens stores as pamphlets etc.

4. How much do you want to spend on advertising?

Choose how much money you are going to spend each month. Whether it would be $50 or $100, but you stick on with it.

If you haven't seen the expected response then you increase the amount or change the advertising method.

5. Track your ads constantly:

You should know what is happening to your advertising money. Simple equation like 'how much profit I am getting with the expenditure of this budget'.

http://www.webmasters-central.com/wprofits/tracking.shtml

Put some code in your emails when you want to track the response to your ezine subscription.

Check your weblogs to see the referer after you keeping an advertising banner on some other site.

If you don't see the response change your method or ad wording.