Starting a Blog

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I have been thinking about this for a while now. I wanted to start a blog but i am having trouble thinking on the theme of the blog. I would love to make a blog about so many things but i wouldn't want to mix them all up. I would like to make a blog that would help newcomers to Pokexgames which is a online game, about makeup (which is something i love) or even fictional stories. I don't know where to begin because i don't even know what theme i want to start my first blog about. Any ideas to help me out here?