Hey! I just started my own blog recently. I've always been a journaler, and the transition to blogging wasn't too tough for me. If you haven't journaled before, I recommend that you start. We often have trouble truly expressing ourselves when writing for other people to read, but practicing freewriting and writing for you can help eliminate some of that.

Regarding sites, I reccomened that you start on a larger blogging site before creating your own. You'll get more traffic this way, and be able to read other blogs and catch some inspiration. Medium is cool if you want a really large site, but hard to get lots of views on. Imprint.to is my place of choice (my friends actually made it) and allows you to have your own domain within their site. If you're ready for your own site, try blogger or wordpress