Have a Theme; trying to make each page take on the same look?

This is my first post, and I've reviewed different Forum Pages to determine the best place to post this question. I apologize if this isn't the correct place, but it's the best location I could figure.

So, here's the deal. I'm working on developing a site and decided that based on my Client's needs, that I need to learn Drupal and develop his site within this CMS. I figured it would allow him to easily maintain the site once we get it online. At this point, I am working with the "Blue Masters 7.x-2.1" theme in Drupal 7. I have been reading the book "Beginning Drupal 7" and attempting to teach myself, but I've run into an issue that I cannot seem to find a resolution to.

Basically, my Homepage looks great. However, when I create a new "Basic Page" it looks completely different from the theme itself. In my research, I have found that the most likely solution is that I have to create a new .tpl.php file for each individual page. For instance, my Navigation includes "Home" followed by "About" -- so, seemingly, I would have to create a file named "page--about.tpl.php" and that file would then contain the necessary formatting information for my "About" page, to make it look similar (i.e. same font, background, etc.) to the "Home" page.

So: Is that the correct solution to this question? Or, is there a more efficient way to accomplish what I'm trying to do here? Because basically, I want the site to have a uniform look across all pages, but right now it just isn't working out that way. I hope that I've explained my issue adequately, but if you need more info, just let me know.

I'm new to Drupal and new to this site, so please bear with me. I appreciate any help that anyone might be able to provide.

Thanks!