It is better to start from Blogger if you are an absolute beginner. I also recommend you to try WordPress or other static blogging using Netlify or on Github pages using technologies like Jekyll.
You should definitely consider a minimal template or theme when you start your blog. You don’t want to overcrowd your website with bulk content.
Make sure to write at least 10+ articles before you start promoting your blog on other platforms. It is crucial for a great start.
Write long-form content which is really useful for your visitors. And it should worth their time as well.
If you prefer to build a custom CMS (Content Management System), make sure to code well with comments. It can really help you later period.
Consider a good hosting platform for hosting your blog online. It can really help you to increase the page speed, performance etc.
Always try to promote your content on social platforms like YouTube, Pinterest, etc. It can boost your traffic.
Make sure to follow the best SEO practises always. You should not recommend anything that harms your visitor.