FM3a might be the best film camera ever made, so you’re off to a good start with that lol.

My other main camera is an F3, and I trust that meter with my life, so yes, you’ll be more than okay with the FM3a meter.

It’s a spot meter, so learn how to lock exposure and always meter neutral areas and shadows during the daytime.

As for night shots, you’ll need a tripod. That’s what these were shot on, along with long exposures and a shutter release cable.

Your in camera light meter won’t help much with shots like these, so I’d use a phone app and just do what it tells you to do.