Adding Read More

Hello,

I would like to introduce ‘Read More’ feature on my blog, where the summary of the post is shown on the main page and the full blog is shown when Read More link is clicked. Question is how do I do this?

I have read this article on WordPress (http://codex.ww.wp.xz.cn/Customizing_the_Read_More) on the issue but I am totally lost. Could some one explain how to do this in simple terms?

Is there a plugin to do this?

Also would like to display the image (if the post have one) on the front page.

Thanks in advance for help.