I started with a "Kitchen Crop " 4-tier sprouter with a mix of broccoli and alfalfa. I start one tray every other day and harvest the off day, so it is continuous. Change the water in the morning and at night. It's low maintenance, just make sure seeds aren't getting caught in the drainage holes.

I have since branched out to multiple types of microgreens, but those get a little more complicated and require lighting of some sort. Once you have a plan though, you get to be a human-in-the-loop robot to keep the machine going. :-)