For an idea of what kind of material I think should be in here, this is the first draft of the wiki and excerpt I've come up with.
Main features:
Tries to emphasise that this isn't for just being new, it's for problems that are inextricably about being new.
This is hard to get across except with examples, I think, so it's the weakest part of the draft. But I think it's important to address somehow? Pointing people to alternatives later is part of showing what isn't inherently about being a new GM.
Points people away from using new-gm and toward using a plain system tag if they just have a rules question.
Lists some of the other more specific tags that c/should be used instead.
I based the list on ones askers have commonly used along with [new-gm] mistags, as well as a few that it occurred to me should maybe get used more often.
Exerpt:
Questions about becoming or tutoring a game master (GM) serving for the first time. Use this only when the question's inherently about being new, not simply as a descriptor of your skill level whilst handling a situation.
Wiki:
For asking questions about the problems inherent in someone being new
to the game master (GM) role.
Tagging guidance
Use this tag when the problem is inherently about being new to
GMing, not just when the problem is caused by or the result of being
new to GMing.
If the problem is about some other aspect of running roleplaying
games, and being new to GMing is why you don't know the answer,
don't use new-gm. Instead, use a tag that describes the problem you're experiencing. In particular, questions about how a game
works should have the tag for that game system, and don't need this
tag.
If in doubt, leave it out!
Other subject tags
There are a few other tags useful to someone who is new to RPGs; tags that are more specific, and
when they apply they should be used instead of new-gm:
- system-introduction — For questions about how to learn or teach a particular game or system. (Not used when just asking for
rules clarifications.)
- gm-techniques — For questions about or asking for specific techniques to achieve specific effects, used while GMing.
- gm-preparation — For questions about preparing yourself and your materials for a game session.
- campaign-development — Whether a new or experienced GM, preparing a campaign is a whole topic on its own.
- adventure-writing — Everyone is new to designing/writing adventures at some point, even experienced GMs.
- problem-gm — For asking questions about a GM who may be causing or connected to conflicts in the gaming group, regardless of
whether the GM is new or not. See also group-dynamics.
- group-dynamics — Use this tag if you're trying to figure out how to pick your GM or how to manage changing GMs.