Google says they like longer-form articles, but the real question is if your readers are going to read it. If your readers aren’t going to read it then what’s the point of putting it out.

Since your building the blog from scratch you can do either (put out long-form or short-form articles). It really just depends on how often content is going to come out (it’s really hard to put out a long-form content every day) and the quality of the content (if it’s bad quality nobody is going to read it).