I don't have much advice. Here's what I have:
Write for your audience. Figure out who your audience is kids, teens, young adults, adults, elders, etc.
Always make sure your writing is the best it can be. Correct grammar, spelling, wordings, etc.
Pick a good topic that you have a lot to say about. That way you can come up with alot of ideas for posts.which I bet you have :)
Pick an idea that you think other people would be interested in.So, maybe don't talk about the boring things to do wi th your topic.
Pick a good theme that is easy to read and had a look to match the blog. This really depends on the program.
I recommend using Blogger (google ran) but that would be social media.
Yeah, thats all I can think of now. If you have exact questions, just ask. I hope I can some day look at your blog. :)