Welcome to the Atlassian Community!
Confluence is indeed a wiki service, and if you're starting from scratch (or moving from other systems), I would recommend you think about two things here:
1. Structure. Confluence divides its data into spaces, and the configuration is generally hung off the space. So which users can do what, where the landing page and top level pages for a space are held, look and feel, and so on. Sketch out a broad structure - what you're going to use each space for, and how you need to control access (if at all). A single space for everything can work fine, for some groups of people, but you will probably find you want to have several - our main Confluence for example, is a mixture of spaces determined by client, team spaces and shared group spaces.
2. As you say, templates. Confluence has a load of templates built in, and you can make your own (making them global or only for use in one space). Make use of those when you're building pages.
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