Always buy your domain as soon as you know which one it is. I recommend GoDaddy or Name.com. If you have a blog name that could easily be misspelled I would purchase it as well, I mean it’s only ~$12 a year!

As for hosting, hold off until we chat because depending on the type of site you need, the hosting may change. The majority of the time it is WP Engine for WordPress but if you’re selling products, Shopify would be your hosting.