1st--- read this (as the owner of ANY parrot) --welcome BTW
Here's what I wrote to someone asking for the basics (welcome BTW):
There is a lot to caring for a parrot--- Scarlet Macaws can live have 80 years.
I am going to write a ton here because it sounds like you are very new to this and there is a lot to learn. I don't mean to overwhelm you!
You shouldn't buy an un-weaned baby. If your bird is not fully-weaned, I would bring him back to the breeder and insist that they finish weaning him BEFORE you bring him back home. There is SO much that can go wrong if you try to wean a baby yourself without proper experience. Here is some more information on weaning issues: So you bought an unweaned baby...
One really important thing when keeping a pet bird in the house is that you cannot use scented products or chemicals/fumes in your home (even things that smell nice to us(---things like smoke, perfumes, air freshener, standard cleaners, vaping, burning food, incense, cigarettes, glue, paint, window sealing kits, polishes, aerosol sprays etc can harm your bird's sensitive respiratory system (which is not the same as mammals'). Using products that heat or are heated which contain Teflon/PTFE/PFCs = very very dangerous. These products off-gas and can kill a bird in under 5 minutes. Teflon/PTFE/PFOA/PFCs are most commonly found in the kitchen (pots, pans, cookie sheets, drip trays, air fryers, popcorn poppers, baking mats, crock pots, toasters, toaster ovens, popcorn poppers, waffle irons, electric skillets etc. They can also be found in space-heaters, curling irons, blow-dryers, straighteners, heat lamps, heat guns, irons, ironing board covers etc. These fumes have killed birds through closed doors and on separate floors of a home, so you should replace your cookware with stainless steel, cast iron or ceramic.
You will need an avian-safe cleaner to use within your home (both on the bird cage, but also, around the house). Again, chemical cleaners cannot be used in the home unless avian safe. F10 SC (the yellow/clear concentrate) is a great, avian-safe disinfectant. Other (less effective) options include products such as "poop-off", white vinegar + water, grapefruit seed extract + water, baking soda etc. Peroxide is also fairly safe for disinfecting places like your bathroom, but you do not want your bird to come into contact with it.
Some foods are toxic to them--avocado, coffee (even decaf), caffeine, rhubarb, alcohol, onions/garlic/leeks/chives, mushrooms etc. Salt is also very bad for them, as is most human food. They love it, but it's not healthy.
They should not just eat seed--you will want to feed lots of washed fresh vegetables. Fruit is fine in moderation, but too much can lead to obesity and behavioral issues due to sugar. I feed my bird a mix of high-quality seed (no sunflowers, no peanuts) and pellets (in addition to fruit/veg). Fruit pits are toxic, as are apple seeds. Corn cob and certain nut shells (if swallowed in big pieces) can cause blockages, so you should be very cautious if you give your bird nuts in the shell. Peanuts can harbor aspergillosis, and should be avoided altogether (even they you often see them marketed towards parrots).
It is important to make sure that your bird's toys and cage are made of safe metals. Stainless steel is safest. They can get metal poisoning from playing with or mouthing objects made of unsafe metals.
They need a set amount of sleep each night (at least 10 hours) and the largest cage you can manage with lots of different perches. You want to avoid the totally smooth/round ones as they can lead to a condition called bumblefoot. Never place a cage near drafts and never allow cool air to blow on a bird. They are sensitive to drafts and any temperature shift greater than 10 degrees can cause a shock to their system.
They need lots of safe toys and safe wood to chew. Not all wood is safe, so don't just assume you can give them any kind you want.
They hide illness and so you have to watch them to make sure they are eating normally and pooping normally etc. You should try to find an avian vet (certified avian) if at all possible and take your bird AT LEAST 1 x yearly for an exam. An avian vet is NOT the same as an exotics vet who sees birds--- so if a certified avian vet is available within a few hours of where you live, you will want to set up care.
Macaws and all parrots can easily confuse the relationship with their human for a sexual one. You don't want this to happen, even though it seems sweet at first. Stick to petting on the head and neck only (the rest is sexual) and do not allow your bird to play in shadowy places, like boxes or under furniture, as these spaces are similar nesting sites and are hormonal triggers.
Food and water should be replaced daily--- wash the containers daily. Never leave wet food out for more than a few hours (as it can lead to bacterial growth). Never try to medicate a bird via drinking water and never add vitamins to water. Vitamins can be over-dosed easily and harm a bird. Plus, when you add things to water, it makes it impossible to know how much they have gotten and it also encourages bacterial growth. Sometimes it can prevent them from drinking adequately if they don't like the flavor of whatever it is you added.
These birds have the intelligence of a 4-year-old human, but they are wild animals (not domesticated like dogs). This means that they see the world (and humans) in a very unique way and so you must learn about their behavior in order to prevent problems (screaming, plucking etc). They need lots of time out of their cage daily and a lot of interaction (at least a few hours). At the same time, you don't want to spend TOO much time with a bird of they will become overly dependent and not know what to do with themselves when you go to work etc.
Finally, baby birds are ALWAYS sweet compared to adult birds. When your bird hits puberty, expect that it will exhibit some annoying and problematic behaviors (much like a teen). A through knowledge of behavior and setting expectations at an early age will make your life easier when that time comes, but do prepare yourself and expect that things will not always be so smooth-sailing. Think about a baby human compared to a teen...
I am sure there is more...but that is a basic overview of caring for birds.