Yes I have towed b4 but I've never towed a car. Only motorcycles and Atv's. So Im not familar with the 7 pin harness and brake controller

 

Then you have the 7 pin, that is the plug next to the hitch. Just go to u-haul and they will give you a car trailer with the surge brakes. For that small of a car you will be fine

 

Like VR-MSM said. If it is a manual tranny, put it in neatral and use a dolly. I towed an 85 RX-7 (also RWD) 12 hours using one. Take it easy and give yourself extra room to stop. That 318ti doesn't weigh much more than the RX-7, around 2500 pounds. That way, you don't have to worry about 7-pin, trailer brakes, brake controllers, etc. and it' only $40 from Uhaul.