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Hello, The set does require a set top box in order to receive over the air, satellite or cable broadcasts since it lacks a modern aerial tuner built into the set (as it's a Plasma display and not an actual TV). As far as the speakers, I'm assuming you received the display without it's included speakers? There are side mount speakers that screw on/affix to the sides of the set. They are removable so I have no way of knowing if you received this set without the speakers.
However if so, then ANY small 8 ohm speakers can be connected to the speaker output (black and red) spring clip connections on the back of the display to produce sound.
Regarding the STB, any unit that uses a Scart connection, or RCA Yellow, Red and White can be used.
In most cases you can obtain the STB from the cable/SAT provider, or purchase a Humax box.
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