Hey guys Im new here! Looking to gain some knowledge.

I am looking for advice on setting up my first turntable rig. Let me give you the basics. I want a decent system, one that I can grow from but is still quality. I plan on putting it in a room that is 20'W by 20'L by 14' H in feet.
I plan on using a Pro ject Debut carbon. Pro-Ject Audio Systems
I have not picked out a pre amp and am not sure if I will need one with the other equipment.
For speakers I want to use 4 Mackie mr5mk3 and the mrmk3 woofer. Studio Monitor ? Mackie MRmk3 Series | Studio and Home Recording
and this to connect the speakers - i think it has a phono preamp in it? Mackie - Big Knob
Any recommendations on the equipment?
Also the room is set up to have surround sound I was wondering if I could use the mounts in the ceilings for the 4 speakers? I read something about sound degrading if the cord is to long.
Thanks guys!