How a website works.
When you sign up for a website you're assigned a folder (directory) in a special kind of computer called a server, designed to serve files to the web. The directory has your website's name on it, and only you can access it for the purpose of adding or removing files. When you first visit your site it will have a page put up by the host, perhaps saying this site belongs to _______ and is under construction. This is the index or default page, .htm or .html. You will need to make up your own index.html and replace the one on the site. You may also need to remove the one there before people can access yours. Your index page will have links to your other web pages. Most webhosts do not permit "hotlinking" directly to the files from other websites, so you will need to place links to the files on your pages, and only post links to your pages, not to your files directly.
The links you post on your pages will mostly be of two types, those which download an image or other file to the page and use a "source" tag, or those which link to another file or page and use an "anchor" or hypertext reference tag.
Color Chart