New build with recycled parts on a ridiculous budget 120cm*60cm work area

[Neale]

If you are standing at the machine with X going from left to right (- to +) then Y should be set with - at the front and increasing as it goes away. Convention says that X=0, Y=0 is the LH corner nearest you, although that's not essential. However, the relationship between X and Y is very important because your machine needs to be set up the same way as your CAM software. Z usually is zero at the top of travel and - at the bottom (so Z machine coordinates are always negative, except at the very top of travel).

If you are using F360, look at the little RGB axes that come up on the drawing screen, and imagine those transplanted on to your machine bed. Orientation of X, Y, and Z absolutely must match.