How to make my blog to be a high position in google/yahoo search engine?

In addition to what puccagirl said. Indeed go read some guide/ebook. I recommend Dan Thies' SEO fast start. It's an amazing ebook for it's price: FREE. It isn't that difficult to master. Just read up on it and step for step apply SEO and learn new ways of attracting traffic every time new methods are invented. Don't go for traffic exchange traffic, they're not interested in your content.

Relevance. You have to outrank every other webpage in terms of relevance. And the search engine determines this relevance through some kind of scoring algorithm. It's not exactly the page rank, but it is one of the contributing factors. The number of incoming links, low bounce rate, volume of traffic, density of keywords or a combination of keywords, age of the domain, and so on.