The school idea is good, but it is very rare that there are many newbies playing, and then the leaders can ask for help.
You raised some points that I liked. First, this guild might ask every newbie if they want to join, and it gives a short description of what they have the option of joining. Next, the newbie guild would need a budget. Newbies can be expensive to maintain, since to kill they need a weapon, and it can't be coded to give the newbies a weapon that fits their stats. And face it. Virtually every newbie that comes out of that tutorial has a glyph.
About the rping. This was a good point. The way I feel about this is that if a newbie doesn't get the concept in a group, how else will they learn it? Few create accounts to log in at first, and it takes a dedicated, real guild to teach and enforce rp. This newbie guild is just a more specialized, custom tutorial, and if being bombarded with rping instructions doesn't work, then it's up to the guild they join to reinforce it. For example, they might understand the brackets, but not anything else. Upon joining the strict rules of 'The Sheeples,' they might finally be able to apply this confusing knowledge to something at last.