Pro/E has a very good CAM part. It is in Pro/Manufacturing mode. There You can generate the NC code programme. The problem is, that if you have not used before it is a little "heavy".
But you can import the Pro/E solid model in any CAM package and to make the NC there. Try with the original ".prt" file first. If it does not work, use the old good ".igs" format.
About the cutting conditions:
The rule is: For soft materials as PP use only new sharp tools and depends of your machine, high "RPM" and high "F".
I do not recomend 12k-15k, because the material will become melted and possible burned. Use not more than 4k-5k with a proper feedrate