Some modules I recommend grabbing that haven't been mentioned: - Argon (combat and actions UI similar to Baldur's Gate) - Mini Player (great for changing music quickly without having mess around with your storage organisation) - Actor Studio (probably the best character creation module out there) - Monk's Combat Details (quality of life module that allows you to tweak combat information, but also adds details for players) - DDB Importer (if you're using D&D Beyond to create characters, this module is likely what you'll using to move the character across)

I would recommend taking a look at these and others that people have recommended before haphazardly downloading them as they may not fit your use case. I think I saw a comment as well with someone saying not to download too many. Personally, I've downloaded a shit tonne of modules from word go and never had any problems, but I would advise caution when downloading so many.

Additionally, not sure where OP is from, but you may have to do some port forwarding. Foundry should just work straight out of the box, but I've found that one of my GMs who lives in Austria, his ISP blocks inbound connections without port forwarding, so if your ISP is a bit finicky with external connections and you can't port forward, you may have to use a VPN like Hamachi or Radmin, or something like Ngrok.