Bloggers who do this find it easy to blog consistently and easily. Plus, they have more fun with their blogs than those who start off by winging it.
1. Decide your focus.
Will it be personal, a creative endeavor, a tool to build name recognition, a monetization effort, or what?
2. Decide how much time you can devote to the blog on a daily or weekly basis.
The more you blog, the easier it is to attract readers. Readers like fresh content especially if a blog interests them. Just be consistent. Tell your readers how often you'll blog.
3. Decide what is legally fair game to post on your blog.
Legal issues regarding copyright infringement by using text or images owned by others can leave you open to lawsuits.
4. Decide who composes your target audience.
What are the demographics and interests of your target reader? Know this in order to appeal to what interests them.
5. Decide on an editorial calendar.
What you write about should be broad enough that you can write about various aspects often yet be specific enough to interest your target readers.
A compelling blog is hard work, but it's also very rewarding. All it takes is some focused thought to make it attract readers.