Craft often requires a different approach than Wordpress, but can be just as easy and powerful to use when set up correctly. The big unknown in your situation is how your content architecture and templates are set up.
Content architecture and template decisions in Craft are custom from site to site and designed by the firm that created or maintains the website. To help further with you question, we'd need to understand how your sections and navigation are set up, if your sections have URLs, what assumptions your templates are designed to make about the content they output, and so on. Getting training from the firm who built the site or hiring a consultant to walk you through your site and give you a tour of how things work could be helpful in your situation.
A few resources that could help you get started:
If you are in the situation where you are looking for a consultant or firm to work with, there are a couple of Craft professional listings and job directories. At the time of this post: