Threads with GM tips pop up every now and then. While many people here aren't ready for GMing, there is a decent number of those who have passed the threshold of readiness.

another thing that could be interesting to have made is a "Am I ready to GM?" test. one that would provide the sort of example problems like sudden RL work and such. Quite a lot of the ones who do start RPs could become great GMs, but they need guidance and to know some of the possible realities. And most of all, they need persistence. Just because an RP doesn't work the first time, doesn't mean it won't work the second time.