Yafray and Blender?

How does this combination exactly work?
I’ve searched a little bit, I wanted to find some tutorials but I couldn’t find any (I haven’t searched that long but I think this method is much faster).

So, what I want to know is how I can use the yafray render-plugin in an efficent way.
When I try to render the files with the same settings as for the Blender Render my results look very different and I don’t really know how to set all the Yafray settings up to get a similar Rendering like with the Blender engine.
It would really help me if anyone could just post a link or write a little “introduction”, a short information about the general yafray options.

Thanks in advance!