First of all, submitting a blog to a search engine is no guarantee that it will be visible in search engine listings.
Second, Google isn't going to reply back to your complaint unless they believe they need further proof of ownership from you. If you have submitted adequate proof of ownership to them, they will further investigate the problem and take whatever action they feel is necessary.
Finally... no, you can't "protect" your blog using a DMCA. A DMCA is used to report copyright abuse. If you are going to write, either for yourself or others, it might be a good idea to do some research and become educated on copyright -- your rights and responsibilities and your country's remedies for copyright infringement.