Where should I actually start with gundam? Seriously.
If you want to just dive into the franchise and get a taste for it?
Gundam 00.
It's set in its own universe so you don't have to know anything about Gundam to get into it as such, but it shares the same themes so if you like it, you'll like other Gundam shows too. It's 2 seasons long (total something like 50 episodes) and one movie (which takes place after the anime).
If you want to get into the older stuff, I recommend watching War in the Pocket. It's short, and very enjoyable and set near the beginning of the main franchise universe canon.
If you want to watch the whole franchise from the start, see MJJ's post