So you starting create a blog or a web site(actully not so much different between blog and a website.
How do you start created a blog/site? By find the idea and inspiration for the blog/site content? Or by find the best themes?
If you build a blog/site using cms such as WordPress, Joomla, Drupal, or else, picking a themes is a must.
For some blogger or web admin, the inspiration could be come from the themes or templates that their pick. At least that i ever did.
It doesn’t if it is a free themes/templates or a paid one. As long as it is meet your need, so use it. Paid themes/templates doesn’t guaranteed you will have a good web or blog, and so free themes/templates it is not a reason that can make your blog or web look cheap.