Pretty much any mains powered zigbee or zwave device With the exception of smoke detectors and the Sengled bulbs Will work as a repeater. (Zigbee repeats only for zigbee, zwave repeats only for zwave.)
You don’t have to do anything special: that’s how mesh works. 
So switches, plug-in pocket sockets, plug-in sensors, in wall micros, and wall outlet’s: they should all work.
A number of light bulbs will work, but they tend to have some problems and are not usually a good choice.
What country are you in? The device selection does vary somewhat, but in both the US and the UK most people just use plug-in pocket sockets. They tend to be less expensive then wired in devices, they are obviously easier to use, and you can move them around if needed.
See the following FAQ. Start with post 11 in that thread, then go up to the top and read the whole thread.
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