First is safety. Many of us on this forum always had firearms on our homes and were shooting in the woods with our dads before we can remember. We might take things for granted that people who have not been around firearms do not already have instilled in their brain.
For someone who has not fired a gun, I very much recommend training. With your bank account, you can afford quality formal training. Until you are comfortable shooting in a controlled environment, a rule to follow is that you should never load a firearm indoors (except at a range). Another rule is that unless disassembled or open, a firearm should be treated as if it is loaded. The firearm loaded part will come into play at a range and you will need to train yourself safety and etiquette as to always be aware of where the barrel is pointing and always have it pointed in a safe direction, loaded or not. Reading online pet peeves of range behavior will give you an idea of what is expected. The rule loosens up slightly when as to the obvious condition of the firearm (obvious and visible open action/cylinder or plastic chamber flag) and your experience increases.
You will also need to think about a storage method for ammo and firearms. Kids in the house? If you are set on getting into firearms a full-size safe might be an early purchase.
You have a lot of fun "work" ahead of you - don't rush the training and learning part.
As for the grocery list, my advice would be to begin slow to see what you like and avoid buying a lot of stuff that you don't yet know if you'll really want or use. For the actual firearms themselves, I recommend buying "keepers".
The first two purchases for me would be a quality .22 bolt-action repeating rifle and a quality .22 revolver. Get your initial instruction on these two firearms. Become proficient at using iron sights on the rifle and maybe later you can put a scope on it. Shooting with irons skillfully is important. I love being able to hit with iron sights. Don't think of these .22 firearms as "beginner guns". In a real world, they do have a purpose. You will never regret or want to sell a nice wooden-stock full-size bolt-action .22 or a .22 revolver. Learn to safely hit the bullseye every time with these - it will be a foundation for everything else.
Some have mentioning getting some sort of semiautomatic rifle or carbine that uses detachable magazines like an AR or AK type firearm. I don't disagree. But it is real easy to give into the urge to jump into this end of the swimming pool and buy every accessory under the sun.
Which? AK or AR? It's what you prefer and you probably don't know what you prefer yet. You many end up wanting both. A good range will let you rent and offer instruction on their operation. Learn what's good and bad about each type. There's really no hurry at the present moment but I can foresee a distant future where firearms of this type might be heavily regulated. After you gain a bit of experience, deciding what you want, maybe buying the semiautomatic firearm and some quality magazines to put back for later after you have mastered the .22.
As far as these weapons systems and accessories, I personally prefer a keep-it-simple approach. Opinions and tastes differ. Anything you want to hang on these is available, scopes, red dots, flashlights, flare launchers, bipods, magazine pouches, cigarette holders, coffee makers, you name it. My own favorite rifle for decades of this type is a 90's Colt with built-in carry handle (iron sights) and sliding stock. No optic, no flashlight, no rails, no nothin'.
As for other firearms - 9mm/.40/.45 pistols, .38/.357/.44 revolvers, concealed-carry pieces, holsters - there will be time for all of that. They will be available after you learn to handle, shoot, and hit with your .22's.
This is just my take and my initial advice. Enjoy this! Go slow and be safe.