Everything is a lot of Star Trek! (but you should really watch everything eventually)
I recommend tackling it one series at a time, and it will go by faster than you'd think,
My wife and I started with Star Trek: The Next Generation (TNG) and I think it is a great place to start!
After that you could watch Star Trek: Voyager (VOY) or Star Trek: Deep Space Nine (DS9). DS9 being one of my favorite pieces of media ever. I love it so much. 🥲
Or if you want something more modern you can start with Star Trek: Strange New Worlds (SNW). The second season airs in a few weeks, and I hope it's just as amazing as the first season!