3 phase motor capacitors?

[TalonMotorFabrication]

I need some help from those that know about 3 phase electric motors. I changed my knackered single phase 3hp compressor motor for a 5.5hp 3 phase so that I could run 2 pumps from the single motor, how ever the new motor did not come with run capacitor(s).
Now what I need to know is do I need a capacitor for every phase then join to the poles of the motor or is it a case of just putting one on a single phase to just kick start the motor??? Also what sort of rating would I need? any help would be great please before I either burn the motor out or burn the workshop down!