Just use WordPress. It's usually the best one for such beginners as you, is considered as a very simple platform and it's also the most popular one among free ones for web building
You'll get a subdomain with it, enough functions and types of designs to choose, plugins and extensions. It's very convinient for working with templates too which provide you pre-made types of design which can be easily modified even by a total newbie and movie wordpress theme
https://www.templatemonster.com/category/movie-wordpress-themes/ is one of the most popular for example. Besides considering how this platform is popular, there are so many helpful tutorials about using it and also you can get help rather fast in the special community.
As free ones I can recommend you Blogger, Tumblr, Medium and Ghost. Wix and Weebly are nice platfroms too but they're non-free however very cheap at the same time ($12-18 per month).