It ended up not being too difficult after all. While I can't transfer files to and from my phone, I can sync my contacts to the phone from my iMac G5 20". Here's how to do it:
1) Go into the System Preferences > Bluetooth.
2) Turn on Bluetooth on the E815.
3) Add the new device via the Bluetooth control panel.
4) Start up iSync, go to File > Add New Devices, and add the phone.
Once the Motorola Phone appears in iSync's list of devices, you can start synchronizing contacts between Address Book and the phone.
1) Go into the System Preferences > Bluetooth.
2) Turn on Bluetooth on the E815.
3) Add the new device via the Bluetooth control panel.
4) Start up iSync, go to File > Add New Devices, and add the phone.
Once the Motorola Phone appears in iSync's list of devices, you can start synchronizing contacts between Address Book and the phone.