Well, where I live in the world (North Carolina, USA), I would imagine I’m somewhere between the middle of the ball (equator) and the top of the ball (Arctic). So yeah, that happens to be a position where none of the bubbles are in the middle. 😊
There are many resources online regarding reading order / starting out suggestions (e.g. https://www.discworldemporium.com/reading-order/). However I think the stories are usually light-hearted enough that you might as well start in the middle of a sub-series.