If you have the expertise or a passion or interest for a subject, you're ready to start making money with a blog. With a service like Blogger (www.blogger.com), you can start up your blog totally free. You can also create your own site and secure your own hosting for a low price, which is generally the route I recommend, as many free blogging sites have restrictions on what you can say or do, including making money or advertising.
In the long-term, it affects your versatility, functionality, and, of course, your brand. In the short term, it can certainly add/take away a lot of headaches. That said, just like choosing a physical house or office, there is no such thing as an absolute “best” or “top” choice. There’s only the right choice relative to your goals, experience, and circumstances.