Coming from a Gundam fan, you really don't need to watch anything before IBO. It does its own thing, it does it well, and it's completely unconnected to any of the other Gundams so anyone can jump in. I legitimately believe it to be a great first Gundam.
If you insist on watching something else first though, watch the original series. Mobile Suit Gundam. Not the compilation movies, the full 43 episode series. If you want more, Zeta Gundam and Gundam ZZ are direct sequels, followed by the movie Char's Counterattack. Where you go next from there is up to your preferences. Pick whatever sounds nice.
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