How to know supply of keyword?

• For this end, you don't need any other tools. Just go to Google, Yahoo or whatever search engine you like and type car in search box.
• Look upper right bar of search result page and you can find something like "Results 1 - 10 of about 301,000,000 for ''car". The number '301,000,000' is approximated number of supply. For sure, not all of them are blog, but realize that if you talk about car you're just 1 out of 301,000,000. This means that you may not pick up "car" as your keyword and choose other topic if you want many visitors to find your blog from search engine. This is why you need to save above demand table somewhere.
• Now that you know topic "car" is too competitive, next thing you can do is to find number of supply for other keywords from table you saved. Continue this step until you find less competitive keywords.

You may choose several keywords and use them in your blog. But remember that if you post a short blog, it's better to focus on only one keyword. If it's long, you may choose primary and secondary keyword.

To sum up,

• Use Search It to find reasonable demand of keyword related to your blog.
• Check number of supply from a search engine, for example, Google.
• Choose keywords that have high demand and low supply.
• Finally use that keyword in your blog repeatedly with frequency of a bit more than your high school English teacher would tell you.

While pay-per-click scheme seems easier to perform than pay-per-performance, latter has sound reason you may have to consider:that is, amount of commission is much higher than that of former.Most of case joining an affiliate program is free, so no risk and no catch is involved. But certainly you have to put more effort than you do with Google Adsense. You can regard 'more effort' as a cost of 'free' and 'more commission'.

The bottom line is always to consider running Google Adsense on your blog and if you are looking more income, consider joining some affiliate programs and placing affiliate link on your blog. If you want know more about affiliate program (how it works, how to optimize, etc), you may want to pay a visit Affiliate Business Web Site. Though that web site is not aimed to bloggers, you can find lots of information about how to implement affiliate program.

When you choose an affiliate program, most important thing you have to keep in mind is that that affiliate program must be related to your blog topic. For example, when you're talking about "car", an affiliate program about "how to make an e-book" does not make sense and won't generate any click through.

As a final word, it can not be overemphasized importance of your blog content and traffic. Why I suddenly raise these two subject while I'm talking about how to make money blogging? Because...

• it is or must be content that finally lead your readers click links
.
• the more traffic, more chance you get clicks.