The Performa 475 is a decent 68k Mac. Yes, you will need a keyboard and mouse, and an Apple to VGA monitor adapter and any old VGA monitor, but if you cannot find them in Poland, then shipping for a keyboard+mouse+adapter will be a lot cheaper than a whole computer.

"Beeping" would mean that it is giving the startup chime, which is a good sign. Still, up to you if you want to wait for one that is known to be working.