What's the best Stack Exchange site to ask questions about agile software development on?
First, you have to prepare a backlog of questions about the Agile/scrum methodology. Be sure that each question has a clear 'definition of done' that will allow you to judge when it is complete answered.
Second, go through the questions and rate each according to its business value, so that you know the relative importance of them. Be sure to consult all your stake holders to ensure that these values reflect the different needs of the organization.
Third, guess how many questions are likely to be answered in a two-week sprint. Post that many questions to programmers.stackexchange.com.
Fourth, demand that all the participants in programmers.stackexchange.com show up every day for a 15 minute standup meeting to report on their progress.
Fifth, at the end of the sprint, evaluate which of the questions has been answered to your satisfaction. Calculate a 'velocity' based on the number of questions answered. Be sure to let the community know their velocity. Exhort them to improve it.
Sixth, lather, rinse, and repeat until.
You get all your questions answered.
Or you get a suspension.
Programmers.SE is for all things at the whiteboard, including development methodologies.
The agile tag there is their most popular to date. Again, stick to the FAQ to remain on-topic.