How to use referencing in a blog?

Hi, Im an undergraduate student at Warwick, I am planning to star a blog on politics/economics, and I would like know what referencing if any, would be recommended. The first thing to say, is that I want a high quality blog, something worth putting in your CV, however, I am not planning to write University essays, I am planning to write articles. My University (as many I can imagine) uses the Harvard referencing style, I wonder if this would be as good for articles. Finally, Id like to ask what to reference, should I reference every statistic, so for example if I say, 15% of households like this, should I say after this something like (Statista, 2020) and then a full reference in the reference list? Thanks for your help.