The Afterlives For Dummies explains such things as how the bodies of people in the afterlives function (they wear down normally but sort of pull themselves together by magic, typically on a scale of hours to days; injuries that happen faster than that will happen normally before healing, even to the point of causing vital signs to cease for a while, but things like aging or starvation just take too long and reliably can't take dead people down even temporarily; they can be made to heal into a different shape, including a permanently injured one or one with new limbs, but it's fiddly), and what kinds of public works there are in the most appealing afterlife polities (the Dead Republic has so much free education and otherwise relies on a combination of the fact that no one really strictly speaking has needs and the fact that no one will strictly speaking be at risk of bankrupting themself if they give to strangers; New Jerusalem has free food and housing; the Bastion of Peace has a homesteading program). It devotes more time to explaining how to navigate New Jerusalem than anywhere else but it does give a very basic introduction to commerce in the Dead Republic. It also incidentally mentions that there's easily available magic for learning to speak all languages, and that it's hard to move between afterlives in the same way it's hard to get back to Earth. (The Dead Republic subsidizes the cost of leaving since they like being able to use exile to deal with the fact that they can't really execute people who won't stop causing problems. New Jerusalem subsidizes the cost of moving in. Moving from one to the other is pretty cheap.)
The other book is thick and kind of dry. It contains the top nine most commonly referenced documents for newcomers to the Dead Republic, including a brief guide to its laws and customs (don't start violence for no reason or you'll have to pay weregild and maybe have to move out of town or even leave the republic altogether; don't steal things, likewise; don't bring kids under twelve into dangerous hobby areas such as might have tigers roaming around; most residential areas unless otherwise specified ban offensive displays like strobe lights or public sex but there are a lot of exceptions and which things are allowed is a major factor in most people's choice of where to live; elections are staggered so some offices are up for election every five years), and a list of major cities that might be good choices for random people to move to, and some details on how to get onto the waiting list for some cool magic.