I think it would be nice to have a bot, somewhat like slackbot that you can use to learn and interact with on https://try.discourse.org
Interacting with trybot would be achieved either by replying directly to a trybot post or mentioning @trybot
Some example interactions I thing would be handy:
@trybot can you reply to me in 20 seconds
Trybot posts a direct reply to my post in 20 seconds
@trybot can you create a new topic
Trybot posts a new topic on try
@trybot what is a badge
trybot links to a topic on meta explaining the badge system
a help post pops up explaining about the commands you have an so on.
After a user makes their first post trybot could post a welcome message explaining what it is and what it does (also mentioning that try is just a playground)
I find that a great way to be introduced to Discourse is interact with it, having a trybot will allow people to try out Discourse outside of a vacuum, make testing all sorts of cases a lot easier and so on.
An initial version could be as simple as having a map of regex -> post body.