Hi Gregg,
Yes, it should be enough. Preferably with a decent
IDE (E.g. Eclipse
with the J2ME plugin).
However, if your only developing for a specific mobile phone, you might
as well find the it's SDK and emulator. That way, you won't
(read: shouldn't, in theory) get any problems when you try to run it on your mobile.
Motorola Software Development Kit /Svend Rost