I chose to Learn Dreamweaver and I am getting it pretty well after watching all of the tutorial videos but how can my customers update and add content to thier site the easiest way something like WordPress? Reason I abandoned Word Press all together was because of the load times on my shared web server hosting account compared to a basic written website with a few pages. Is it common for people to add Word Press to it's own directory to serve as the back end of a site were content is added? But if so whats the best way to migrate an auto feed into my Dreamweaver made website from the say POST or PAGES pages? Word Press just navigates to slow for me. Even without a lot of plugins. Plus I like the creativity I have over creating a page from scratch. Although i'm thinking once I get used to Dreamweaver more I will be able to import and redesign a Word Press page and style sheet! Right?
Unfortunately your customers must know how to upload new files...etc there is a way that allow your clients to EDIT content by using the adobe contribute web publishing but still have to know some basic...etc
The site needs to be content managed, you need to add a CMS say like wordpress, if you used a wordpress theme and hsoted it, you could adapt the site to your customers requirements and even use plugins to hide the fact your even using WP at all. I have used WP on many sites and it works great, for my own sites and clients, i dont use dreamweaver anymore.
Better to find a good web host. The problem you are having is that your web host is using PHP_EXEC to keep each user jailed from other users resources. There are much better ways of doing this. The problem with PHP_EXEC is that it will not fork a process. Because of this behavior it will open a completely new process with all of its overhead for things like file includes. Wordpress is built on includes. The index page includes the wp_header file. It includes the settings and config. They include many includes from the inc directory. They also include all of the template files. So if one person comes to your site it is as if 100 people did to your server. Now make that 24 people on your site at once and it is too intense for shared hosting and the limited resources given to you. Namely memory. Your account will consume too much processing power once memory is exhausted and the host will ask you to upgrade to a dedicated server. It won't use PHP_EXEC since you are the only one on it. That server will run flawlessly. But... and this is a mighty big but - you could have received the same level of performance from a shared host that doesn't use PHP_EXEC to separate their users. Look around and ask hosts.
You can create pages from scratch in Dreamweaver for WordPress using page templates. This allows you to use HTML, PHP and other languages that you are familiar with. Using the WordPress codex you can also add the header footer and other things from the WordPress website. This is a great way to start learning WordPress. Good Luck! :-P
You could always create hidden back-end where customers could log in and edit the text. This could easily be programmed with PHP, ASP/NET, etc. If could get intricate if you wanted to give them the ability to change design/colors; I'd suggest just letting them update the wording from a back-end solution.