I actually just spent sometime looking into this as well, based on your post here - the whole question about the poles... and what I read as far as the scientific community goes made no sense whatsoever, like how not only do they flip, they also shift apparently all the time, which again... is something which to me makes no sense at all.
They use "the poles flipping" as reasons for mass extinction, yet my own present day research on that topic [mass die off's as far as fish and wildlife go] tends to have more to do with over-population causing an unsustainable living situation more than anything else [they actually taught us that in school - in NYC - back in the 1970s in science class]
As far as establishing a model of how the flat earth works, for me anyway - just thinking about it - the whole flat earth theory - makes a whole lot more sense than the round earth theory not to mention that there's a certain logic about it which also totally makes sense without having to think about it too much.
One thing - speaking of poles - which I always wondered about is why are the poles not the axis - or are the poles the axis ??
If that's the case, than if the poles shift [you can google that if interested] then the earths axis would shift too, if the poles are the axis, no ??
Then, my favorite - the magnetic north - as opposed to the true north pole - is it the magnetic north pole that shifts and changes position/location as opposed to the true north pole when the topic of poles flipping goes ??
Also - as far as gravity and the poles go, is gravity felt the same at say the equator as it would be at the north pole in a round earth model - meaning would we weigh the same ??
I'm very new to the idea of a flat earth - but for me - a flat earth answers a whole lot more questions than the round earth does.