You can convey the size and scope of your site by using a map or contents page. Let your readers control the site. Offer navigation buttons to allow them to link to the different sections of your site. Reading from a screen is not like reading a book or magazine. Long passages of text are hard on the eye and should be broken up into smaller, more manageable chunks.
Web browsing is a fractured activity.
Hypertext links mean that your readers may only dwell on your page until they see an interesting link. If you want them to read your page, you must get and then maintain their interest. Look at the HTML source of other Websites to see how they work around these restrictions. If you have structured your material effectively, you should be able to structure it into manageable 'chunks'. Don't make your reader scroll down the page for too long - it would be better to split the information across two pages.