Driving motors works

Driving motors with PWM from midrange PICs works. There are 2 PWM outputs. They commandeer the Timer2 to control the signal timing. Working out what to set the timer bits to to get a given frequency and the duty cycle is a bit of arithmetic, but not too hard. I found a web site that helps you calculate it, plugging your required values in gives the required bit settings.

Using an Arduino is very, very much easier. There are six PWM outputs available and a single line of C code to set the duty cycle. The PWM frequency is fixed, so a less flexible. It is possible to change the frequency, but all the on-board timers get badly affected in the process.

If you want to drive more than two PWM with a PIC some of the PICF18 range have more PWM outputs. You could also output a simple signal on any pin controlling it yourself, but that would be a last resort for me, indeed I'd add another PIC first to get two more outputs.