I developed my first website and now use Hosting24 as my website host. I also uploaded my HTML files to the web. However, when I try to access my website I see a index o/ page with links to my website. What do I have to do in order to have my website coming up when I type it into my server?
This is a page which looks like a directory listing? Then there's a configuration option which will prevent that from being displayed. That option would of course be controlled by your website host, so contact them.
You should also configure your site so that if somebody uses the URL for the whole site and not for a particular page, the site automatically forwards or redirects to your home page. Again, your hosting company should be able to get that done. Or if it turns out to be your responsibility, they should at least show you how to get to the management console or whatever it is they have set up for you to manage your site.