Little Project

A sponsor approached a couple members of my team asking us to build a little machine for him for his local business. For this project we plan on using 2-3 cim motors controlled through an arduino/rasPi. Couple of questions, i am personally not experienced with rasPis or arduinos but one of the members is, unfortunately he is unavailable for a couple days but will be when the project starts and i need to set a plan with the sponsor. What motor controllers are compatible with the pi or arduino using pwm?
Another idea that was given was to use bluetooth to communicate with the arduino from an android phone, say buttons on the screen to control motors off/on and power level. is this possible? And does appinventor have the ability to create the app to do this?
Is there a good alternative to using an old FRC PDB? We are wanting to use this because of the 5V supply to the pi and a simple way of distributing power
Im sure i will have more questions later but this is all i can think of atm.

I’ll sum this up with 1 current question: how can I control a CIM with an arduino? Where can I find a compatible controller?

Arduinos can output a PWM signal that can be used to control a Talon, Victor, or Jaguar. You’ll want to use the Arduino’s Servo library.