We assume people have, and are familiar with 5E, and are not beginners. 4th level characters are used so we can showcase some of the archetypes, combat maneuvers, and so on. Everything a player needs is right there on the character sheet--if they know 5E, they'll have no trouble running those characters.Thanks for the response - I had seen the sample characters and wondered about the decision to start at lvl4.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.