Setting them up can be a little fiddly, and I often refer back to my post on the topic which contains instructions for--amongst other things--enabling WiFi and SSH by adding a couple of files to the
boot partition. Always keen to optimize, I took things one step further and wrote a small interactive script (creatively called
configure-raspberry-pi) to set up the basics. You can find it on GitHub.
While setting up this script and looking for ways to configure additional things like the hostname, I came across PiBakery which is focused on enabling large-scale Raspberry Pi deployments1. It's more than I need, but could be useful if you need to do more complex things.