Hey Adam,
Congratulations on launching your new site and welcome! First, you should read our best practices to organize your content & launch:
Then, you could read the Discourse Moderation Guide to learn more about moderating the site and become familiar with Discourse. Have a look at our most popular plugins and try the ones the look interesting. Since you’re starting from scratch, it’s a good idea to look at live Discourse sites and draw inspiration from them.
The default version is adequate unless you want to make specific additions (Update the FAQ, Privacy Policy, and Terms of Service). I’d also recommend browsing the community category to learn more about running a Discourse site.
The search tool is your best friend as our community here has found solutions and methods to do brilliant things with Discourse. However, the above guides are great to start with 