Let's say we've mapped out the sitemap and there are about 10 pages. How many of those pages should I create as mockups? Of course, it's a given that there should be the landing page. But aside from the landing page, what other pages should I create (keeping in mind that none of the mockups I give will be final)?
It would have helped to know the sitemap, it's very important to know what pages with what functionality you will have and isolate only 3 of them. Aside from homepage, 2 other pages should be presented. Especially since they are not final.
Basically just show your most powerful and iconic 3 pages. That's how I usually present my work.