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Most important thing is to ensure your blog is in some way or the other relevant to the niche of the guest writers you want to invite. Do a little research and find those blogs which are new and are also on the lookout for the same. It will immensely help you and the other blogger too. Maybe you can even contact those who are looking for guest blogging opportunity.
Most succesful bloggers prefer to guest blog only for those blogs which are successful or atleast are becoming popular. So first develop a blog with good content and eventually Google will do the rest for you. But don't rely too much on guest blogging, instead develop quality stuff of your own. Nothing beats that.
I hope this helps you and other too who are looking for answer to same question.