It can be somewhat difficult to start up a new blog. It will take serious effort to separate your blog site through the rest since basically anyone can set up a blog.
Don't ever copy something else. You don't need to be professional, but you will should be knowledgeable and passionate about your subject.
If you put in place your blog, consider buying your own domain name instead of putting your blog site with a free site. It is an inexpensive venture, and will also help you in looking more professional.