Register the name on different social networks. The big ones are Facebook, Twitter & Instagram. Check the availability of names with namecheckr.com. Try to keep the names the same; Twitter has a maximum limit of 15 characters.
Choose your blogging platform. To start, I recommend WordPress.com, the Personal Plan with a custom domain approx £50 pa (per user).
Create the structure of your website. Keep it as simple as possible (what you do, where you are, who you are).
The reason to have a website is that people can find and interact with you; the reason for writing blog posts is to share what you discover and increase your visiblity; the reason for your social networks is to connect with others.
Later, you can use something like Buffer to bulk schedule social media updates linking to that week’s blog post, and then create daily adhoc status updates via WordPress approx £50 pa.