It's going to be really challanging for anyone to advise you based on the information you have provided so far. The only advise is that using a CMS solution like Wordpress will make it easier for managing the content especially is web development is not a strength. Now if Wordpress is appropriate for the requirements is something you will need to investigate in more detail.
I would think a CMS is an overkill here since you can just work with a provider to set up a website from a template that is meant for a site with a few pages of static content. That would cost just a few bucks per month and your client can be up and running by the end of the day.