Writing a blog or anything else, ask Google about the matter. Ask Bing and ask Duckduckgo. I searched with Google: "write my own blog". I got 1 billion 260 million results.
https://www.google.com/search?client=firefox-b-1-d&q=write+my+own+blog
I asked Bing. I got 32 million results:
https://www.bing.com/search?q=write+my+own+blog
I asked Duckduckgo. I got an unknown number of results:
https://duckduckgo.com/?q=write+my+own+blog&va=z&t=hk&ia=web
I started the blog to advocate for meditation. I saw much strong evidence that sitting still for 10 minutes and keeping my attention on a single anchor, something I could see or maybe my breath, would be good for me. Over time, I found more and more excellent authors writing about mediation. At the same time, I got bored with repeating simple directions about 10 minutes of sitting. I realized I could more or less follow the example of Montaigne and write about my thoughts, events of the day, whatever.
Many people try to make money from a blog but I am not interested in doing that. Most often, doing so involves putting up ads or product endorsements.
I use Google's blogging service but the links above can offer many alternatives. Google's service is "Blogger" so to get to that, put that name into a search service or click on blogger.com. An example of a new blog is "Where is my watch?" by Dr. V. McGlone.
Personally, I think it is best to write every day but many people write irregularly or weekly or such. I don't worry too much about numbers of readers. I just let friends or friends of friends know I write. I email to about 70 people each day and one of those email posts that day's blog on the webpage for "Fun, Fear and Filoz". I try to be even-tempered and not defame people or snarl my prejudices. I read each post to my wife for assurance.
I compose in Google Docs, and store the posts in Google Drive. It can be fun and helpful to look back and see what I said sometimes. In the fall, I will hold a LIFE class to discuss attempts, failures and successes with blogs.
