One-time install, domain and hosting

Like the original poster here I am thinking of grabbing a domain name (example.com) and buying the “one-time install” package to get Discourse up and runnning. The plan is to run a small forum, but in future I may want to implement other functionality in addition to the forum.

  1. In your comment above, do you mean that an address like discourse.example.com or forum.example.com is a more futureproof approach?
  2. If so, I assume changing that address is easy to do, or is that done as part of the one-time install?

Thanks
Dan