Play GB games

So I have these old, original Game Boy (like, the grey one with the maroon buttons) games I wanna play again (original Pokemon Blue). What can I get to do so?

I bought a GB on eBay but the screen was barely visible. I'm comfortable partially building/programming something myself, and would also be fine with an adapter or some such that allows me to play the cartridge or copy its contents so I can play on my laptop or Raspberry Pi or whatever.

Suggestions sought!