Hello and welcome to Android Forums. We have some Motorola Milestone discussion areas you might find helpful. Not knowing if your device exactly matches a particular area, I'm leaving you a link to all of our phone areas. You will find the Milestone area in the list. Please be advised that root information is most always device specific so proceed with caution. I would use the information as a reference unless you are certain your the exact area for your device. Here is the phone list link: Android Phones - Android Forums
Best of luck to you and I hope you enjoy these forums.