First: I changed both your header and text because it was in ALL CAPS. It’s poor etiquette to use all caps as it is considered shouting and thus impolite. So please refrain from doing this.
On-topic
– subs are most likely also powered (active) speakers. We talk about subs (short for sub-woofer) and tops (top-end speakers), the latter also called full-range speakers. If they have built-in amplifiers they are called active or powered speakers, if not they are called passive speakers.
– There are many (correct) ways to set up your main PA. Slightly in front of the DJ booth and a few feet to either side is surely one of them. One on each of the four corners of the dance area aimed at the middle is another. And plenty of variations in between. The reason to put them in front of the booth is to have no/less problems when using a microphone (feedback). The 4-corner setup helps distribute the sound with more balanced volume over the dance floor and contain the sound somewhat in the dance area.
The further you put the main speakers away, the bigger the problem with latency becomes. Hence the need for monitor(s).
Monitor placement depends on the type of monitor, the space behind the booth and your personal preference. I have seen booths with two 15″ powered speakers on stands on either side of the DJ’s head like a super-sized headphone. Personally I always use one ear for headphone cueing so I don’t need or even want a monitor on that side. I will always have only one and it will be on the other side of the headphone cueing.
I have a pretty compact monitor that sits on microphone stand which I set on hip height and tilt upwards at my ear. You could, if you prefer, set a speaker on a stand at the height you prefer (ear height makes sense) or you could use a floor monitor firing upwards at your ear (keep an eye on the correct angle). I have my monitor slightly to the side of booth firing at me. Directly next to you is an option as well. I advise against setting your monitor behind you, due to the way sound and your ears work.
Hope that helps some.
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