New moderators should be aware of the general duties they are to perform. Basically it's not much. Mainly just to clean-up, or weed out malicious postings. This power shouldn't be misused. You don't edit or remove a post just because you may not agree with it. It's where people write things like "Mince is a Twa*", or "F*** O** you A*******, Mince" (with the comma in the wrong place), or do one of those clever "drawings" using just keyboard characters, and typing, "Sit on it, Mince, you -------", etc., etc.
Of course, that doesn't happen every day, so I wouldn't want to put any potential volunteers off.