This podcast is right on the money. It really goes to the heart of the matter. Listening to this podcast will definitely make sure you don't learn the hard way.

If you want this product for 1st time DM advice, you've come to the right place: there is plenty of stuff relevant to a 1st time DM but it doesnt get 'round to it until 19 minutes 27 seconds, and prior to that it didn't make a lot of sense, so you might want to skip that: enjoy!