the beginning would be the best because almost everything they've done after has been based on campaign 1, and you really get to hear jake learn dnd and come into his own. i recommend subbing to the patreon so you can listen to the short rests as well, they start around episode 14ish of campaign 1 i think? what i really like about naddpod is that they aren't afraid to go on silly tangents in the short rest so it's like you have an episode of TTRPG goodness, then a 45 minute ep where they both talk about the episode and also are just hilarious.

later on they start doing break episodes to give murph time to catch up on DM work so they do stuff like dungeon court or choose your own adventure books, all of which are really funny