I would start with one printer, only print PLA, then talk to your neighbors and family about it and focus on printing things they want and use.

The card stands were a lot of fun, but most of what I print now are dog toys and gifts for my niece and nephew. It's nice to roll up to a family holiday, and have something interesting and unique you can just hand out.

You could get started doing that for just a couple hundred bucks and some desk space!