I'm pretty certain it isn't mentioned, though I suppose it might be in the DM Kit (which I don't have). I would handle it pretty much the same as with a non-Essentials character. I know there are official rules for that somewhere, but when I started my party (no Essentials characters in it) at 5th level, I told them to pick one magic item of their level, one of their level+1 and one of their level-1, plus 100 GP and whatever mundane equipment they wanted (within reason). I believe the official rules call for more gold if I remember correctly.
Bottom line: I don't see any reason why this should differ if a character has an Essentials build as opposed to a non-Essentials build.