This is a chronological timeline, watch origin after Mobile Suit Gundam.
Mobile Suit Gundam The Origin (UC0068 - UC0077)
Start Here:
Mobile Suit Gundam (September, UC0079)
Mobile Suit Gundam: The 08th MS Team (October, UC0079)
Mobile Suit Gundam 0080: War in the Pocket (December, UC0079)
Mobile Suit Gundam Thunderbolt (December, UC0079)
Mobile Suit Gundam 0083: Stardust Memory (UC0083)
Mobile Suit Zeta Gundam (UC0087)
Mobile Suit Gundam ZZ (UC0088) -- Hard to find a good one on the high seas. Box set is equally ridiculous expensive.
Mobile Suit Gundam: Char's Counterattack (UC0093)
Mobile Suit Gundam Unicorn (UC0096)
I'd stop here, but they're good shows, just hard to find on the high seas for the ones below.
Mobile Suit Gundam F91 (UC0123)
Mobile Suit Victory Gundam (UC0153)