Here are instructions on installing wordpress: http://codex.wordpress.org/Getting_Started_with_WordPress#Installation If you would only like only certain pages to be used then you would create those pages in wordpress and link specifically to those pages in your navigation or wherever you reference these pages.
http://codex.wordpress.org/Getting_Started_with_WordPress#Installation their forum is very helpful with any question you have
You can use easy application install option from your host , Its quiet easy to install. if you need custom installation then you can pm me.
Be careful using the easyapps option from your host because in my experience this is often an old version of Wordpress and not the latest one.
GoDaddy has truly one-click install of Wordpress and much more. I typically prefer to install my own software, but I've never seen an installer so slick. And yes, it was the current version of Wordpress! My rule of thumb is this - the Wordpress installation procedure is written in simple, easy to understand english and is really a quite painless procedure compared to some other software I've had to install in the past. If you don't currently possess the knowledge required to install it, you really don't have the knowledge it will take to maintain or build a site on it. It's a sad fact of life. If you ask us for help installing, you're going to be back to ask us about every little thing you don't understand. That's not fair to us, or to your website users. Instead, go read about this stuff, it's all over online for free on blogs and sites, easy to find. Once you know how to install it on your own, you're far more likely be able to maintain it on your own too because you understand how it works.