Gundam UC watching order of the original trilogy:
Gundam I: The Movie
Gundam II: Soldiers of Sorrow
Gundam III: Encounters in Space
Zeta Gundam A New Translation: Heirs to the Stars
Zeta Gundam A New Translation II: Lovers
Zeta Gundam A New Translation III: Love is the Pulse of the Stars
Gundam ZZ
Char's Counterattack
That covers the Amuro/Char saga nicely. Though I advise against watching the Zeta movies and instead watch the entire show. It's that good.