What do you want a blog for? If you just want to share your day to day life with the world, that's what Facebook and Instagram are for now. People who blog these days are either selling something or trying to build a profile in order to sell something, or are specialists with a lot of information to share on a subject.
If you are in the latter categories, than your business plan or the nature of your expertise and the audience you want to reach should dictate the kind of content you create.
Unless you have a specific goal in mind, you won't build an audience and you wont keep up the blog. Start by figuring out what you goal is and work from there.