That's nice. Now, try to add more unique content and concentrate on building links for the blog and hopefully, your earnings will improve
Thats nice, great job. Since you are thinking of migrating to your own domain I would suggest that you do before the blog gets to big. What you can do is build the blog on your domain but start with fresh content that is not on the blogger domain. After you have your new home open make a post in the blogger site stating that you have moved to your new domain. Since blogger is free there is no reason to pull that site down but only funnel the traffic to your permanent site. The problem with using a free blog service is unless you plan to stay for good all the post that have been indexed are linked to yoursite.blogger.com instead of yoursite.com.