Depends on if it is being sold with or without an amp. Either way you'll need an RCA cable to go from your receiver to the amp. If the amp is external then you'll need some speaker wire too.
If it is being sold with an amp the above is it. If there isn't an amp in the deal then you should get in contact with the seller about what he/she recommends to power it.
You will need an amp and a crossover that can accept speaker level inputs. There are many plate amps that include this kind of crossover. Parts Express sells what you need. You should ask the seller how much power the sonosub requires (some sub designs require a lot of power to shine)...