>>48123
- Watch the first season of Gundam Build Fighters
- That's it.

Just go with the production order or be me and go with chronological order. I lost the infographic on that one so I just link the wikia to you.
http://gundam.wikia.com/wiki/Gundam_Wiki:Timelines

I'm sure you can just watch ibo if you have zero knowledge about gundam.

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.

>>48123
You don't need to watch anything to watch IBO. If you really want to get into Gundam, watch all of the Early Universal Century timeline series/OVAs/Movies.