You can use pretty much any 5.1 speaker set for this receiver (See exception below). Here you might find something suitable: www.digitec.ch/en/s1/producttype/hifi-heimkino-lautsprecher-...
Some of the Jamo sets are actually quiet nice, though they often don't have a subwoofer included. So you would have to buy one separately.
Since this receiver has an impedance of 6 Ohm (check Datasheet), you should not use any speakers below that. So no 4 Ohm speakers. 6 and 8 Ohm are all right. That's the general rule of thumb for speakers and receivers and as far as i know the only limitation to pay attention to. Datasheet:
static.digitecgalaxus.ch/Files/7/9/0/2/7/4/4/VSX-832.pdf
This Receiver supports FireConnect Wireless Speakers only. It's not really for a surround setup, but for Multiroom. I'm not even aware of any Wireless Surround speakers.