How to Have Multiple WordPress Content Sections on One Page

Hi,
For my wordpress website I am looking to have one page that has multiple sections that dynamically load underneath the previous sections/content on the page(or replace it) when requested (through a button click or something). I probably haven’t explained it in the best way so I will use a series of questions to explain what I am looking for.

I would like my website to be composed of several different sections rather than pages (by sections I really mean a series of several pages, each with their own page editor, seamlessly sown into one master page (making them sections of the master page instead) so that there is only one URL and a new page doesn’t load). Essentially I want to seamlessly load several pages together in one page creating a master page. Does anyone know of a plugin which is designed for such a purpose, or how it may be accomplished otherwise. I have little coding experience (I am learning but I haven’t gotten too far yet :P).

Also, as well as having several sections/pages joint into one master page, would it be possible to have it (as I briefly mentioned earlier) so that the sections dynamically load when requested, either replacing or following below the previous content/section? For example, when a link/button in the menu bar is clicked (such as the about us button), the isolated page/section created relating to the about us link dynamically loads below the previous statically loaded section (i.e. the default section that loads when the website is initially loaded), and when someone clicks on a new link/menu button (such as the contact us button), the isolated page/section relating to the contact us link dynamically loads, replacing any previously loaded section (the about us section in this case).

I know what I am asking may be impossible for an inexperienced coder, such as myself, to accomplish. However, any reference to a related plugin or even any coding help on how to accomplish would be greatly appreciated!

Thanks ??