Ahh I’m so glad you want to start a comic! It’s such a rewarding experience! There are several ways you can go about hosting, depending on how much time and money you wanna spend!
The easiest way is with a site like Inkblazers or Topastic. They’ll let you just upload pages and create all the infrastructure for you, including archives, chapters and comment sections. They’re really easy to manage and I’m pretty sure you can get a custom URL for either. It also puts you in touch with a huge userbase of people who use the site, so even if you host elsewhere it’s still a good idea to use one of these mirrors. It’s really ideal if you’re just starting out and have never hosted a website before.
Another option is to post it to tumblr! You’ll need a theme like Simple Webcomic Theme but then you can simply post pages like you would an image. And then people can reblog it and follow the blog, so it makes it easy to follow/spread the word. You can point a custom domain at it too!
The trickier option is hosting it externally. To be honest I have no fucking idea how I did this, it’s a total miracle. But my hosting is with Hostgator and they have an automatic WordPress install, and then you can apply a theme like Webcomic to manage it. I’m sorry, I can’t provide any more specific information because it’s all a blur of angry buttonmashing as I tried to set it up. I liked it in the end though, because I like having it on my own domain/website (which yes, I do pay for! Hostgator is quite cheap).
I hope that helps! All these websites/services have help manuals/customer service chats that will be able to give you more specific info!