My world of Orea follows...mostly....basically....the Great Wheel with a few tweaks and additions. There isn't a ton of planar jumping around...but there need to be places for various critters, challenges, and powerful entities to come from.
The Prime Material Plane includes all of the various planets of what we would call the universe, and all "prime material worlds" from all other physical dimensions of the multiverse.
The "parallel" material planes, that exist "along" the Prime, coexisting at various frequencies include Faerie (the Land of Fae): a material plane "shone through" with the positive energy plane, the Plane of Shadow/Umbral Plane: a material plane "shone through" with the negative energy plane, and the Elemental (and quasi-elemental) planes: planes made of materials composed of the single element energy/type, its various states of matter, and sprinkled with minute traces of other elements.
Along and attached to all Material planes, connecting them to the Positive/Negative Energy planes, and the Ethereal Plane are the Plane of Dreams/the Dreaming, which has a "flipside" (the "Upside Down" we'd probably call it now) Realm of Nightmares - not exactly/entirely its own plane. Fabricated "Demi-planes" (by mortal or other entities) -which require a decently strong connection to the Material realm whence they are originated- tend to exist in this "void" area of energy and ethereal "stuff" (with which to fabricate the demiplane to its creator's specifications).
Coterminous to the Energy/Elemental/Ethereal planes and directly connected at various points within it is "the Spirit World." The happy/kind/helpful/good spirits tend to gravitate more toward the positive energy and fae realms. The not-so-nice/dangerous/evil spirits gravitate toward the more umbral places and negative sides of things.
All material planes are contained within/under an umbrella of the Positive Energy/Light/Radiant plane, and within "above" the inverse "bowl" of the Negative Energy/Entropic/Necrotic plane.
And all of that, including the Energetic planes, are contained within -and saturated through with- the Ethereal. Many homeless spirits, incorporeal undead, several supernatural abilities and those extraplanar creatures which can freely travel to the Material realms are to be found here. Invisibility and several illusion magics involve tapping into/connecting to the Ethereal plane.
Here's where things tend to veer off ye olde canon...
Some sages believe the Spirit World and the Ethereal plane to be the same thing...but this is not technically correct. However, moving through the Spirit World and Ethereal (and beyond) is the Yandr, the River of the Dead. When mortals die on Orea, they find themselves in a shallow skiv upon a mist-shrouded, broad, slow-moving river. How time passes there for the spirit/soul compared to the Material realms is completely inconsistent. When breaks in the mist sometimes allow views of the banks, one can see a lush green, bright realm to one side and a bleak shadow-laden desolate land to the other.
Eventually, at the very last reaches for mortal souls to reach of their own accord, the river forks at the island of the goddess of Death & Fate. It does have a set "in game/world" name that I can't recall atm. The elder goddess Desri knows all of the fates of all mortal souls, when their lives are truly done, and how/what/everything they did in it. It is up to this Judge of Souls to send the skiv down the left fork: tranquil, moving through lush green lands, under beautiful sun- or starlit skies; or the right fork: clearly more rough waters, darker banks, stormy skies, ominous red flashes of lightning in the distance. What she says goes and can not be altered. You're on your way to the Outer planes, for better or worse.
The Outer planes aren't set up in the Great Wheel either. There are no "Twin Paradises" or "Limbo" or "Nine Hells" business.
Good souls go through a series of lands/realms of Good-aligned concentric "circles" (infinite in size) from the NG rolling hills and ever abundant farmlands to the CG idyllic forests to, ultimately, the LG "City" of ultimate goodness, including villas and palaces of the greatest gods of Good.
Evil-aligned, from the desolate murderous battefields of NE to the impenetrable strongholds of LE to the ever-spreading destruction and unending layers within the maelstrom (tenuously contained, in no small part, by the LE realms that keep vigil at its edges) of the CE "Abyss."
Both good and evil Outer planes and the branches of those river forks also further branch out and allow egress to the (again seemingly infinite) Grey Sea, filled with the Isles of Neutrality for neutrals of all leanings to find their ideal final rest, as well as immortal entities and deities of Neutrality to have their own realms, palaces, fortresses, etc...
Sooo...yeah, I think that covers everything.