Usually you don't have to create a config file yourself. As distributed, the lircd.conf.d contains a file devinput.lircd.dist. This can be used by renaming it to devinput.lircd.conf. There is also a generic devinput file available using irdb-get find devinput.
This driver uses /dev/input/event0 as its input device per default. You should provide the correct device as --device parameter on the lircd and irrecord command line.
Sometimes the input device mapping changes between system reboots. In that case you are also able to specify the correct input device by its name or physical location by preceding the desired value with name= or phys=. See the Configuration Guide.
In simple setups, where there is just one device available (i. e., there is just a single /sys/class/rc/rc0 directory) the device can be given as auto.
The devices under /dev/input are often writable for some group. On Fedora, current user can be given access to these devices using usermod -aG input $USER, which adds the input group to the grouplist of current user. Other distros have similar steps.